Year	Percent
1991	77.73
1992	78.027
1993	79.384
1994	79.028
1995	79.126
1996	80.025
1997	79.317
1998	80.95
1999	82.039
2000	82.632
2001	83.382
2002	84.804
2003	85.224
2004	85.331
2005	86.726
2006	87.29
2007	87.996
2008	88.646
2009	89.565
2010	90.184
2011	90.255
2012	90.055
2013	89.815
2014	90.056
2015	90.072
2016	89.657
2017	90.245
2018	90.486
2019	90.663
2020	90.789
2021	90.905
2022	90.99