Year Percent 2000 94.46449 2001 94.90686 2002 95.33071 2003 95.73621 2004 96.12338 2005 96.49218 2006 96.84328 2007 97.17688 2008 97.49347 2009 97.79303 2010 98.05413 2011 98.29832 2012 98.56015 2013 98.80678 2014 99.03925 2015 99.2586 2016 99.46581 2017 99.66177 2018 99.78442 2019 99.79753 2020 99.81054 2021 99.81187 2022 99.81313