Women represent 15% of angel investors and 11% of investing partners at VC firms in the United States.
Adam Rifkin stashed this in Business Facts
Source is Pemo Theodore in 2012: http://women2.com/2012/06/27/investing-in-women-infographic/
Pemo Theodore Twitter is @pemo : https://twitter.com/pemo
I found the chart above while reading the Forbes article "This is what an angel investor looks like. Meet Rachel Sheinbein..." :
In 2015, the ratio is worse. 95% of VCs are men: