Year Percent 2005 98.89697 2006 98.90381 2007 98.91061 2008 98.91737 2009 98.92409 2010 99.01065 2011 99.09637 2012 99.18111 2013 99.26489 2014 99.34764 2015 99.42933 2016 99.5099 2017 99.58934 2018 99.66759 2019 99.74463 2020 99.82042 2021 99.89494 2022 99.96411