Code:

2017-07-17 19:48:22 UpdateTip: new best=0000000000000000013ba01219bc01f3508f92d163bd3ed2232999fb5f7c0da0 height=476266 version=0x20000000 log2_work=86.77581 tx=239923846 date='2017-07-17 19:46:07' progress=0.999998 cache=168.3MiB(83054tx) warning='48 of last 100 blocks have unexpected version'
2017-07-17 20:02:21 UpdateTip: new best=00000000000000000090ebfed446fcea8eadfc6d93f6f5ca653709bdb04e0870 height=476268 version=0x20000010 log2_work=86.775885 tx=239927310 date='2017-07-17 19:59:05' progress=0.999997 cache=188.4MiB(93742tx) warning='49 of last 100 blocks have unexpected version'

49%.

News : http://www.coindesk.com/bip91-begins-bitcoins-miners-signal-segwit2x-scaling-proposal-early/