Year Percent 2000 97.61342 2001 97.7086 2002 97.8094 2003 97.90874 2004 98.0067 2005 98.10321 2006 98.19831 2007 98.29207 2008 98.38447 2009 98.47552 2010 98.56525 2011 98.65369 2012 98.74088 2013 98.8268 2014 98.91147 2015 98.97597 2016 98.97961 2017 98.98319 2018 98.98675 2019 98.99026 2020 98.99375 2021 98.99718 2022 99.00058