Year Percent 2000 27.99464 2001 28.03391 2002 28.68635 2003 29.35926 2004 30.05326 2005 30.76891 2006 31.50685 2007 32.26769 2008 33.05207 2009 33.86029 2010 34.69313 2011 35.54994 2012 36.43093 2013 37.33608 2014 38.26551 2015 39.21938 2016 40.19733 2017 41.19972 2018 42.22626 2019 43.27675 2020 44.35115 2021 45.44915 2022 46.57068