According to the American Society of Engineering Education:
% of bachelor degrees earned by women:
2001 19.1%
2002 20.9%
2003 20.4%
2004 20.3%
2005 19.5%
2006 19.3%
2007 18.1%
2008 18.0%
2009 17.8%
2010 18.1%
2011 18.4%
2012 18.9%
2013 19.1%
So, the same percentage of women in 2001 as 2013. Twelve years of attempting to create a more gender balanced workforce in engineering? The links below will provide you with the data for masters and doctorate degrees as well.
https://www.asee.org/papers-and-publications/publications/14_11-47.pdf
https://www.asee.org/papers-and-publications/publications/college-profiles/2010-profile-engineering-statistics.pdf