Year Percent 2000 32.73298 2001 33.74531 2002 34.76577 2003 35.79436 2004 36.83108 2005 37.87593 2006 38.92891 2007 39.99002 2008 41.05926 2009 42.13663 2010 43.22213 2011 44.31575 2012 45.41751 2013 46.52739 2014 47.64541 2015 48.77155 2016 49.68465 2017 50.59775 2018 51.51086 2019 52.42396 2020 52.42396 2021 52.42396 2022 52.42396