Year U.S. adults
2000 52%
2001 55%
2002 59%
2003 61%
2004 63%
2005 68%
2006 71%
2007 74%
2008 74%
2009 76%
2010 76%
2011 79%
2012 83%
2013 84%
2014 84%
2015 86%
2016 88%
2018 89%
2019 90%
2021 93%