Total mined as at present = 18,375,000 mined in the previous halvings + the mined blocks after block 630000
To be ghastlily pedantic, this is a false way to assume the total coins issued. It'd be correct if it was mandatory, by a consensus rule, for each block to have a specific reward in each epoch. But, a miner can choose to issue no bitcoins if they want to. They're free to secure the network by only acquiring the network fees or even dumping those too; although none does.
However, there have been cases where the miner lost the block reward either by accident or intentionally. Check block
124,724. The miner destroyed 0.01000001 by deciding to earn 1 satoshi less from the block reward and by burning the fees.