Year	Percent
1991	93.388
1992	93.48
1993	93.937
1994	93.578
1995	93.288
1996	93.262
1997	92.899
1998	92.985
1999	92.971
2000	93.733
2001	93.78
2002	95.598
2003	95.53
2004	95.556
2005	95.459
2006	95.466
2007	95.517
2008	95.514
2009	95.344
2010	95.424
2011	95.129
2012	94.555
2013	94.325
2014	94.095
2015	94.114
2016	94.267
2017	94.389
2018	94.438
2019	94.497
2020	94.557
2021	94.604
2022	94.651