Year Percent 2000 26.62357 2001 26.66918 2002 27.93187 2003 29.19871 2004 30.46971 2005 31.74487 2006 33.02418 2007 34.30765 2008 35.59528 2009 36.88706 2010 38.183 2011 39.48309 2012 40.78734 2013 42.09574 2014 43.40831 2015 44.72502 2016 46.0459 2017 47.37092 2018 48.70011 2019 50.03345 2020 51.37095 2021 52.7126 2022 54.05841