On Wednesday, February 10, 2016 at 5:39:54 AM UTC-5, Minot Moonshiners wrote:
A BFR reporting system wouldn't do you much good. Those that fly for a living don't do them, as they get check rides ever 6 months or 1 year.

Even if ATP active glider pilots are not counted, an accurate count of the same segment of the active glider population, done the same way each year, will give a more accurate trend line. The absolute number of active pilots could be estimated from the (B)FR numbers.