Year Percent 2000 23.09663 2001 23.91421 2002 24.7318 2003 25.54939 2004 26.96694 2005 28.4217 2006 29.91367 2007 31.44284 2008 33.00923 2009 34.61282 2010 36.25361 2011 37.93162 2012 39.64683 2013 41.39925 2014 43.18888 2015 45.01571 2016 46.87975 2017 48.781 2018 50.71946 2019 52.69512 2020 54.70799 2021 55.84184 2022 56.97569