Over 90% of the total amount of bitcoins that will ever exist has already been mined, according to data from the Clark Moody Bitcoin Dashboard. It is 18.9 million BTC.
Reaching the milestone took nearly 12 years since the first bitcoins were mined on Jan. 9, 2009. However, the remaining supply is not expected to be mined till February 2140, based on network activity estimates and Bitcoin’s halving schedules.
As of December 2021, one block in Bitcoin blockchain, which is is created every ten minutes, is yielding 6.25 BTC. On average, the blocks are halving every four years.
The cryptocurrency which first came out in 2009 had rewarded miners 50 bitcoins for each block that they mined. The first halving occurred in 2012. At this point, the reward for a block was 25, reducing it by half. The next halving occurred in 2016, which reduced the reward to 12.5. The most recent halving happened in 2020, which reduced the number of bitcoins received per mined block to 6.25.