Year	Percent
1991	88.254
1992	87.725
1993	87.027
1994	86.386
1995	86.205
1996	88.096
1997	89.26
1998	89.673
1999	90.519
2000	91.501
2001	91.657
2002	92.333
2003	93.191
2004	93.873
2005	93.828
2006	94.31
2007	94.14
2008	93.809
2009	93.06
2010	93.568
2011	94.332
2012	94.789
2013	95.382
2014	95.53
2015	95.539
2016	95.647
2017	93.178
2018	93.286
2019	93.35
2020	93.424
2021	93.518
2022	93.609