Year Percent 2000 8.05385 2001 9.17914 2002 10.34389 2003 11.54808 2004 12.79173 2005 14.07483 2006 15.39739 2007 16.75939 2008 18.16085 2009 19.60175 2010 21.08211 2011 22.60192 2012 24.16118 2013 25.7599 2014 27.39806 2015 29.07568 2016 30.79275 2017 32.54927 2018 34.34524 2019 36.18066 2020 38.05554 2021 39.96986 2022 41.92364