Better picture (chart at the top of this page).
For reference, here are the exchanges quoted in this script, sorted by volume (Total: >38.38% of reported volume on CoinMarketCap, 2018-03-11)
Rank Exchange Vol% TV TICKER Start Date Currency Continent
01 Bitmex (~50%) BITMEX:XBTUSD 17/01/01 USD America
02 Bitfinex 10.75% BITFINEX:BTCUSD 13/03/31 USD America
03 Binance 6.40% BINANCE:BTCUSDT 17/08/17 USDT Tether
04 bitFlyer 3.55% BITFLYER:BTCJPY 15/06/24 JPY Asia
05 Bithumb 3.26% BITHUMB:BTCKRW 13/12/27 KRW Asia
06 Coinbase 3.00% COINBASE:BTCUSD 14/12/01 USD America
07 Bitstamp 2.84% BITSTAMP:BTCUSD 11/08/18 USD America
08 Kraken 2.09% KRAKEN:XBTUSD 13/10/06 USD America
09 Kraken 1.97% KRAKEN:XBTEUR 13/09/10 EUR Europe
10 HitBTC 0.87% HITBTC:BTCUSD 13/12/27 USD America
11 Bittrex 0.70% BITTREX:BTCUSDT 15/12/12 USDT Tether
12 Bitfinex 0.60% BITFINEX:BTCEUR 17/11/14 EUR Europe
13 Poloniex 0.59% POLONIEX:BTCUSDT 15/02/19 USDT Tether
14 Bitstamp 0.55% BITSTAMP:BTCEUR 16/04/16 EUR Europe
15 Coinbase 0.51% COINBASE:BTCEUR 15/04/23 EUR Europe
16 CEX.io 0.36% CEXIO:BTCUSD 14/07/18 USD America
17 Korbit 0.34% KORBIT:BTCKRW 13/09/03 KRW Asia