Year	Percent
1991	93.416
1992	93.476
1993	93.796
1994	93.141
1995	93.624
1996	93.067
1997	92.158
1998	93.447
1999	93.624
2000	92.913
2001	92.504
2002	94.053
2003	93.918
2004	94.466
2005	94.598
2006	94.479
2007	94.383
2008	95.091
2009	95.83
2010	95.209
2011	94.29
2012	94.029
2013	94.171
2014	93.846
2015	94.268
2016	94.441
2017	94.336
2018	94.383
2019	94.387
2020	94.395
2021	94.383
2022	94.383