Year Percent 2000 28.26598 2001 28.46409 2002 29.70606 2003 30.96245 2004 32.23328 2005 33.51854 2006 34.81823 2007 36.13234 2008 37.46089 2009 38.80387 2010 40.16128 2011 41.53312 2012 42.91938 2013 44.32008 2014 45.73521 2015 47.16476 2016 48.60875 2017 50.06717 2018 51.54002 2019 53.02729 2020 54.529 2021 56.04514 2022 57.5757