Year Percent 2000 16.74954 2001 17.8375 2002 18.93771 2003 20.04967 2004 21.05167 2005 22.04754 2006 23.05187 2007 24.06453 2008 25.08643 2009 26.1167 2010 27.15644 2011 28.20566 2012 29.26475 2013 30.33332 2014 31.41232 2015 32.50173 2016 33.59935 2017 34.70445 2018 35.81745 2019 36.93853 2020 37.12174 2021 37.30085 2022 37.47588