Year Percent 2000 53.41057 2001 54.2575 2002 55.09984 2003 55.93755 2004 56.76973 2005 57.59761 2006 58.42031 2007 59.25677 2008 60.20618 2009 61.14761 2010 62.0811 2011 63.00709 2012 63.89773 2013 64.78116 2014 65.65703 2015 66.52577 2016 67.38995 2017 68.40201 2018 69.41459 2019 70.42753 2020 71.44067 2021 72.45384 2022 73.4672