Tuesday, April 14, is the 19th annual Equal Pay Day. The day is a symbolic representation of the gender pay gap: The average woman would have had to work all last year and into April this year to earn as much as the average man did in 2014 alone. But speaking in averages isn’t always the best way to understand the wage gap. Factors such as race, education and workweek hours can drastically widen (and narrow) the difference between men’s and women’s pay.

For example, the Economic Policy Institute, a left-leaning nonprofit think tank, looked at the hourly wages for men and women across income percentiles and found that at every decile, men outearned women in 2014. The gap is largest at the 95th percentile, with women earning only 79 percent of what men earn in the same income level. The narrowing of the wage gap for low-income earners is largely due to the minimum wage, which is the same for men and women. But the lowest-wage occupations remain disproportionately female.

Happy Unequal Pay Day, ladies.