Nancy1959: about 25 of our members get one every year.
That accounts to 10 years straight for 250 members. Those who have collected those GCs already may not compensate for fluctuation - 10 receivers to quit each year (adding 40% = 4 years) might be adequate. Thus, you might be saturated with GCs in 2030...
Numbercrunching:
Only four Events were in 2014, so 2015, in effect, is the starting point.
Of your 247 members, only 32 have been around since 2015, leaving a vast majority of 215 newcomers in 2016-2018. Thus, numerally, 215 / 2.5 = 86 have left the Gs every year.
BTW: 4 of your 11 remaining pre-Event members of 2012 + 2014 (=36%) don't have or don't show the GC = Golden Calf.