Year Percent 2000 69.29265 2001 69.72637 2002 70.16127 2003 70.59734 2004 71.03459 2005 71.47302 2006 71.91263 2007 72.35341 2008 72.79537 2009 73.23851 2010 73.68283 2011 74.12833 2012 74.575 2013 75.02285 2014 75.47188 2015 75.92208 2016 76.37347 2017 76.82603 2018 77.27977 2019 77.73469 2020 78.19078 2021 78.64805 2022 79.1065