Year Percent 2000 12.13424 2001 14.24814 2002 16.36204 2003 18.47594 2004 20.41972 2005 22.32856 2006 24.20248 2007 26.04146 2008 27.84551 2009 29.61463 2010 31.34882 2011 33.04808 2012 34.7124 2013 36.34179 2014 37.93626 2015 39.49578 2016 41.02038 2017 42.51005 2018 43.96478 2019 45.38458 2020 46.76945 2021 46.76945 2022 46.76945