After the CMP processes my order for 1,000 rds. of M2 Ball, my supply of centerfire ammo will be 11,000 rds. Much of this is long-term storage, especially the M2 Ball and 8mm Mauser.
To answer the OP's question, an annual estimate is approx. 3,000 rds. of centerfire (mostly 7.62x39, and a bit of 8mm M., .303) and 4,000 rds. of .22LR multiplied by active, healthy years from age 57.
The problem in west TN is the climate-too hot/humid to enjoy standing outside much from June-early Sept, and this winter/spring it was too wet much of the time.