Year	Percent
1991	88.189
1992	88.84
1993	88.19
1994	87.93
1995	88.274
1996	88.682
1997	88.835
1998	88.857
1999	89.296
2000	89.673
2001	89.788
2002	89.76
2003	91.025
2004	92.541
2005	92.541
2006	92.903
2007	92.893
2008	93.236
2009	92.96
2010	92.999
2011	92.951
2012	91.805
2013	91.363
2014	90.681
2015	90.69
2016	91.803
2017	91.764
2018	91.905
2019	92.102
2020	92.331
2021	92.558
2022	92.797