Year Percent 2000 26.41693 2001 27.6913 2002 28.99115 2003 30.31589 2004 31.66536 2005 33.03703 2006 34.43261 2007 35.85003 2008 37.28951 2009 38.74943 2010 40.22996 2011 41.72989 2012 43.24886 2013 44.78488 2014 46.33874 2015 47.90881 2016 49.49353 2017 51.09212 2018 52.70309 2019 54.32669 2020 55.9611 2021 57.60557 2022 59.25961