That is just a huge number right there and keep in mind that we're still in 2017, with Bitcoin growing from just below $1000 at the beginning of the year to over $16k right now and speculations said the five digit milestone would only be reached in 2018. That's a whopping 1500% growth and of course would make the market cap even higher.

Not to mention major altcoins like Ethereum, Monero, Dash, Ripple etc have also grown at their own exponential rates in the year giving a big pump to the overall cryptocurrency market cap.