Year Percent 2000 21.26127 2001 22.6635 2002 24.06572 2003 25.41044 2004 26.74884 2005 28.0809 2006 29.40663 2007 30.72602 2008 32.03909 2009 33.34582 2010 34.64623 2011 35.9403 2012 37.22804 2013 38.50944 2014 39.78452 2015 41.05327 2016 42.31568 2017 43.57176 2018 44.82151 2019 46.06493 2020 47.30202 2021 47.30202 2022 47.30202