Over the past 21 months, the cryptocurrency market has ballooned from an $18 billion market (as of January 2017) to over $200 billion presently.
source https://www.google.com/url?rct=j&sa=t&url=https://bitrazzi.com/top-5-cryptocurrency-exchanges/&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNHALn-WoWP8gcwbq3kwLJeD5ZJeww
