Crayola's Law "Colors Double Every 28 Years"

Those responsible for the site/blog www.weathersealed.com did the work. Text from Weather Sealed-

"To create the chart, Velo gently scraped Wikipedia’s list of Crayola colors, corrected a few hues, and added
the standard 16-count School Crayon box available in 1935.
Except for the dayglow-ski-jacket-inspired burst of neon magentas at the end of the ’80s, the official color set has remained remarkably faithful to its roots!
Ever industrious, Velo also calculated the average growth rate: 2.56% annually.  For maximum understandability, he reformulated it as “Crayola’s Law,” which states: The number of colors doubles every 28 years!"