Year Percent 2000 44.14992 2001 45.78492 2002 47.42828 2003 49.07999 2004 50.74005 2005 52.40847 2006 54.08525 2007 55.77038 2008 57.46386 2009 59.1657 2010 60.87589 2011 62.59444 2012 64.32134 2013 66.0566 2014 67.80021 2015 69.55218 2016 71.3125 2017 73.08118 2018 74.85821 2019 76.6436 2020 76.6436 2021 76.6436 2022 76.6436