Year	Percent
1991	94.405
1992	94.342
1993	94.39
1994	93.904
1995	94.15
1996	95.116
1997	94.295
1998	94.264
1999	94.261
2000	94.338
2001	94.135
2002	94.019
2003	94.172
2004	94.046
2005	93.999
2006	93.89
2007	92.999
2008	93.317
2009	93.307
2010	93.282
2011	93.237
2012	93.24
2013	93.127
2014	93.014
2015	93.566
2016	93.227
2017	93.262
2018	93.269
2019	93.26
2020	93.25
2021	93.24
2022	93.229