Year	Percent
1991	96.352
1992	96.432
1993	96.666
1994	96.551
1995	97.048
1996	97.411
1997	97.248
1998	96.993
1999	97.036
2000	96.473
2001	96.402
2002	96.133
2003	96.484
2004	96.413
2005	96.028
2006	95.683
2007	95.586
2008	95.864
2009	95.927
2010	95.607
2011	95.141
2012	94.49
2013	93.807
2014	94.742
2015	96.404
2016	95.343
2017	95.341
2018	95.328
2019	95.315
2020	95.3
2021	95.284
2022	95.269