Year Percent 2000 27.45443 2001 28.86638 2002 30.27805 2003 31.68946 2004 33.10061 2005 34.51149 2006 35.9221 2007 37.33245 2008 38.74253 2009 40.15234 2010 41.56189 2011 42.97117 2012 44.38018 2013 45.78893 2014 47.19741 2015 48.60563 2016 50.01358 2017 51.42126 2018 52.82868 2019 54.23583 2020 55.64271 2021 57.05471 2022 58.46671