Quoted from iceman44:We know they sell 16k plus pins a year from the sequential serial numbers that begin Jan 1 and end Dec 31, this is per distributors. And also from Dwight and other employees alluding to the numbers.
If you use the numbers from ipsnd, you get about 10k, 12k, 13k for 2017-2019.
Those are less accurate for any given year, but the accuracy goes way up over time. Like, any of those yearly numbers you could have about 70% confidence in, but 3 year aggregate is like 95%.