May 12, 2016

Year Favor Oppose
2001 35% 57%
2003 32% 59%
2004 31% 60%
2005 36% 53%
2006 35% 55%
2007 37% 54%
2008 39% 51%
2009 37% 54%
2010 42% 48%
2011 46% 45%
2012 48% 43%
2013 50% 43%
2014 52% 40%
2015 55% 39%
2016 55% 37%

Pew Research Center