Year Percent 2000 42.61214 2001 43.75604 2002 44.89994 2003 46.04384 2004 47.18775 2005 48.33165 2006 49.47555 2007 50.61945 2008 51.76336 2009 52.90726 2010 54.05116 2011 55.19506 2012 56.33896 2013 57.48287 2014 58.62677 2015 59.77067 2016 60.91457 2017 60.91457 2018 60.91457 2019 60.91457 2020 60.91457