Thank you, Chris! I just found the data for my home country of Switzerland here: https://data.snb.ch/de/topics/snb#!/cube/snbnomu?fromDate=1996-12&toDate=2016-12&dimSel=D0(5,10,20,50,100,200,500,1000,T,M). I know what I'll be doing for the rest of my day. :-) They even show coin values (column "Münzumlauf"), although not by coin denomination.