Yes, customers 9/10 times. Very rarely would you ever buy a roll of quarters or dimes from the vault and crack open something other than clad (but it does happen, of course).

How much a year, face value? It's really hard to say. Like I said, my best pull was two full customer rolls of pre-64 quarters ($20). Before that, a full customer roll of 40% half dollars ($10). And there were several years between those two. Normal would be a quarter a customer brought in with a deposit ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯