Year Percent 2000 39.63053 2001 41.14852 2002 42.6933 2003 44.26486 2004 45.86321 2005 47.48835 2006 49.14027 2007 50.81898 2008 52.52448 2009 54.25677 2010 56.01584 2011 57.8017 2012 59.61434 2013 61.45378 2014 63.32 2015 65.21301 2016 67.1328 2017 69.07938 2018 71.05275 2019 73.05291 2020 75.07985 2021 77.13358 2022 77.13358