Year Percent 2002 67.25505 2003 67.25505 2004 67.25505 2005 67.25505 2006 67.25505 2007 67.70467 2008 68.15577 2009 68.60836 2010 69.06243 2011 69.51799 2012 69.97503 2013 70.43356 2014 70.89357 2015 71.35507 2016 71.81805 2017 72.28252 2018 72.74847 2019 73.05534 2020 73.05534 2021 73.05534 2022 73.05534