Year	Percent
2000	79.22879
2001	79.36411
2002	79.49943
2003	79.63475
2004	79.77007
2005	79.90538
2006	80.0407
2007	80.17602
2008	80.31134
2009	80.24073
2010	80.16942
2011	80.09742
2012	80.02473
2013	79.95134
2014	79.87727
2015	79.8025
2016	79.72703
2017	79.65088
2018	79.57403
2019	79.49649
2020	79.41826
2021	79.33933
2022	79.33933