If Bitcoin delivered 50 coins every 10 minutes (600 seconds) the first year, then it should have delivered 50 x (1577000/10) = 7885000 Bitcoin the first year.
But I cannot see this number in any charts like in this one for example where it is said that the first years were added 2625000 bitcoins.
https://en.bitcoin.it/wiki/Controlled_supplySo what is the exact formulas to determine how many bitcoins are issued / year (before halfing)