Year Percent 2000 40.48239 2001 40.62725 2002 40.76984 2003 40.91015 2004 41.04818 2005 41.18394 2006 41.31743 2007 41.44864 2008 41.57758 2009 41.70424 2010 41.82862 2011 41.95073 2012 42.07057 2013 42.18813 2014 42.30341 2015 42.41642 2016 42.52715 2017 42.63561 2018 42.74179 2019 42.8457 2020 42.8457 2021 42.8457 2022 42.8457