Year Percent 2000 19.94496 2001 20.72096 2002 21.59961 2003 22.47368 2004 23.34272 2005 24.20593 2006 25.0632 2007 25.91375 2008 26.75773 2009 27.59351 2010 28.42178 2011 29.24151 2012 30.05341 2013 30.85703 2014 31.65122 2015 32.43571 2016 33.20939 2017 33.97176 2018 34.72207 2019 35.45947 2020 36.18325 2021 36.242 2022 36.30137