Year	Percent
1991	95.536
1992	95.593
1993	95.669
1994	95.395
1995	95.052
1996	94.797
1997	94.831
1998	94.634
1999	94.546
2000	94.57
2001	93.807
2002	94.346
2003	93.555
2004	93.962
2005	94.018
2006	93.816
2007	95.294
2008	95.299
2009	95.311
2010	95.267
2011	95.364
2012	95.905
2013	95.557
2014	95.402
2015	94.916
2016	94.295
2017	94.196
2018	94.172
2019	94.147
2020	94.123
2021	94.099
2022	94.075