Year	Percent
1991	93.018
1992	92.955
1993	92.648
1994	92.758
1995	92.791
1996	92.975
1997	92.142
1998	92.103
1999	92.596
2000	92.484
2001	92.375
2002	92.275
2003	92.386
2004	92.572
2005	92.356
2006	89.075
2007	88.749
2008	88.728
2009	89.296
2010	88.212
2011	84.306
2012	84.125
2013	83.978
2014	83.871
2015	83.3
2016	82.871
2017	82.824
2018	82.76
2019	82.702
2020	82.645
2021	82.588
2022	82.532