Yes No
Nov 1997 25% 69%
Mar 2001 31% 66%
Mar 2002 33% 65%
Jun 2005 33% 66%
Mar 2006 35% 62%
Mar 2008 40% 58%
Mar 2009 38% 60%
Mar 2010 32% 67%
Mar 2012 38% 61%
Mar 2013 34% 64%
Mar 2014 36% 64%
Mar 2015 37% 62%
Mar 2016 41% 57%
Mar 2017 42% 57%
Mar 2018 45% 54%
or as a figure:
[data from the Roper Center for Public Opinion Research]
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