Year Percent 2000 98.18246 2001 98.18246 2002 98.18246 2003 98.18246 2004 98.18246 2005 98.20459 2006 98.22672 2007 98.24885 2008 98.27098 2009 98.29311 2010 98.31524 2011 98.33737 2012 98.3595 2013 98.38163 2014 98.40376 2015 98.42589 2016 98.44802 2017 98.47014 2018 98.49227 2019 98.5144 2020 98.53653 2021 98.55866 2022 98.58079