Year Percent 2000 56.82011 2001 57.56846 2002 59.71909 2003 61.84361 2004 63.94062 2005 66.00742 2006 68.03235 2007 70.02098 2008 71.97963 2009 73.90606 2010 75.80105 2011 77.65125 2012 79.46467 2013 81.2468 2014 82.99848 2015 84.71931 2016 86.40948 2017 88.06831 2018 89.69422 2019 91.28814 2020 92.8515 2021 94.38576 2022 95.89236