Steem is only 0.22% market share at the total Cryptocurrency market volume. Relatively BTC is 52.75% at present 4-Oct,2017 according to http://onchainfx.com information. Concretely Total crypto Marketcap is $135,485,398,501.
I can not calculate the total amount frankly. Anyway great big huge volume compare to 7 years ago.
Below is Cryptocurrency Asset Ranking
(Source:onchainfx.com)
1 Bitcoin
2 Ethereum
3 Ripple
4 Bitcoin Cash
5 Dash
6 ZCash
7 Litecoin
8 BitConnect
9 NEO
10 Ethereum Classic
11 NEO GAS
12 Monero
13 MaidSafeCoin
14 New Economy Market
15 Iota
