The real picture, drawn from annual calendar-year returns stretching from 1928 through the end of 2025, looks less like a savings account and more like a staircase built by someone who occasionally removes a step. Most years are gently or dramatically up. A minority of years are down. And within that minority, a handful of years are so severe that they define how investors feel about the entire asset class, far out of proportion to how often they actually occur.
A Win Rate That’s Better Than It Sounds — and Worse Than It Feels
The headline number is straightforward: including the gains through 2026, 73 of the last 99 calendar years closed in positive territory. That is a win rate north of 70%, which is genuinely a favorable long-run pattern. It is also the kind of statistic that invites a mental shortcut — "stocks usually go up, so any given year is probably fine" — that the data doesn’t fully support once you look at the shape of the outcomes rather than just their sign.
The average annual return across this period comes out to about 10%. But almost no individual year actually delivered something close to 10%. That is the first and most important thing to understand about averages built from unevenly distributed data: a number can be true in aggregate while being almost useless as a description of any specific occurrence. The average height of a group of ten-year-olds and adults might be 5’4", but that tells you nothing about how tall any one person in the room actually is. Stock returns work the same way — the average is a summary of a century of very different years, not a preview of next year.
Why Big Gains Are Common and Big Losses Are Rare
The more revealing split isn’t up-versus-down; it’s how big the moves tend to be. Using a threshold of 25% or more as a rough definition of a "big" year in either direction, the record shows a striking asymmetry:
| What the record shows | What it means | What it does not mean |
|---|---|---|
| 73 of the last 99 years were positive | Being invested has historically paid off more often than not | It does not mean any specific future year is "due" to be positive |
| 26 years gained 25% or more, 18 of those 30%+ | Big up years happen with real frequency | It does not mean large gains repeat on any predictable schedule |
| Only 5 years lost 25% or more, 3 of them in the 1930s, just 2 since WWII | Severe down years are historically rare events | Rare does not mean impossible, and rarity offers no protection to whoever is holding through one |
| A 10% long-run average annual return | Useful for understanding a century of history in aggregate | Not a forecast, and not what a typical single year looked like |
Twenty-six years with gains of at least a quarter, against just five years with losses that severe — and three of those five clustered in the depths of the 1930s. Since the end of the Second World War, a loss of that magnitude has occurred only twice. Large gains, in other words, aren’t just more frequent than large losses — they’re in a completely different league of frequency.
This is precisely what makes the rare bad year so psychologically punishing. An investor who has grown accustomed to a market that mostly rewards patience, occasionally with spectacular upside, is poorly prepared — emotionally, not just financially — for the year everything falls apart at once. It isn’t ordinary volatility that breaks investor discipline; a 5% or 10% dip is background noise most people learn to tolerate. It’s the rare year that erases a quarter or more of value in twelve months, arriving without much warning, that tempts people to abandon a plan at precisely the wrong moment.
The Shape of the Journey, Not Just the Destination
It helps to picture how this plays out over time rather than as a single statistic.
flowchart TD A[Long stretch of modest gains] --> B[Occasional sharp single-year drop] B --> C[Peak investor anxiety and doubt] C --> D[Temptation to sell near the bottom] D --> E[Eventual recovery, often uneven] E --> A
This loop is the honest version of "the market goes up over time." It goes up over time through a sequence that periodically tests conviction at the worst possible moment. The behavioral trap isn’t that investors misunderstand volatility in the abstract — most people accept that stocks fluctuate. The trap is that the rare, large decline arrives feeling unprecedented and permanent precisely because good years have been so much more common, which makes the bad one feel like proof that something has fundamentally changed, even when history suggests otherwise.
What the Numbers Can’t Tell You
It’s worth being precise about the limits of this kind of history. A 73-out-of-99 win rate describes the past; it does not assign odds to any future calendar year, and a string of positive years is not evidence that a decline is "overdue" or that one is not. The 10% long-run figure is an average across very different economic eras — the Depression, postwar expansion, the inflation of the 1970s, the dot-com era, 2008, and more — compressed into one number; it was never anyone’s actual lived experience in a single year.
It’s also worth separating the calendar-year return itself from an individual investor’s experience. Someone who invested a lump sum on January 1 and held until December 31 experienced that year’s quoted return. Someone who added money gradually, or who started mid-year, or who needed to withdraw funds during a downturn, experienced something else entirely — even in a year officially labeled "positive." And these figures typically assume dividends were reinvested along the way; price movement alone tells an incomplete story of what stocks have actually returned over long stretches, since reinvested income has historically made up a meaningful share of total long-run gains.
None of this settles the question of whether trying to time entries and exits around these patterns is wise. Predicting which specific year will be the next big up year or the rare big down year has, historically, proven close to impossible on a consistent basis — but that is a statement about the difficulty of forecasting single years, not a blanket claim that positioning or risk management is always futile over every horizon.
The Honest Takeaway
The market’s long-run history is genuinely encouraging for people who can stay invested through the uncomfortable years, and genuinely humbling for anyone who assumes the ride will be smooth because the average sounds respectable. Most years reward patience. A small number of years test it severely. Judging equities by the full spread of outcomes — not by a single average, and not by the comforting frequency of good years alone — is the more honest way to hold this history in mind before the next uneven year, whenever it arrives.
