Year Percent 2000 27.76824 2001 28.61343 2002 29.47071 2003 30.3401 2004 31.22159 2005 32.11518 2006 33.02087 2007 33.93866 2008 34.86855 2009 35.81054 2010 36.76464 2011 37.73083 2012 38.70912 2013 39.69952 2014 40.70202 2015 41.71661 2016 42.74331 2017 43.78211 2018 44.83301 2019 45.89601 2020 45.89601 2021 45.89601 2022 45.89601