When Satoshi Nakamoto created the first bitcoin in January 2009, there were nearly 21 million coins left to be mined. As 80% of the total number of bitcoins have already been mined by January 13, there are only one-fifth of the capped supply that will be mined in the coming years.

Over 16.8 million bitcoins have now been mined by the miners worldwide and there will be another 4.2 million digital coins that is still left.

Number of Bitcoins Mined

January 15,2016 : 15,089,500 (71.8%)

January 15,2017 : 16,104,750 (77%)

Source : https://www.ndtv.com/business/bitcoin-prices-to-zoom-further-only-20-cryptocurrency-coins-left-to-be-mined-1800099