'The BSA was founded in 1910, and since then, about 110 million Americans have been participants in BSA programs at some time'
So, about 1m kids per year.
Let's say 8/troop and an average of 2.5 years
at troop leader and assume it is all from the last 40 years…
40m youngsters and about 2m troop leaders
over that period of time.
About 1 out of every 250 troop leaders.