Is it true that two thirds of available bitcoins have already been mined? The following commentator writes:


  More than two-thirds of all available bitcoin have already been mined, with the majority going to early miners. 


My question is: Is it true that two thirds of available bitcoins have already been mined?
Indeed it is true, as seen here: http://www.bitcoinblockhalf.com/

As of writing this answer, just over 16.6 million BTC has been mined, out of a total of just under 21 million, which is around 79% of the total amount of bitcoin ever going to be created.