Year	Percent
1991	96.61
1992	96.544
1993	96.439
1994	96.38
1995	96.324
1996	96.647
1997	96.594
1998	96.688
1999	96.379
2000	96.263
2001	96.203
2002	96.353
2003	96.225
2004	96.333
2005	96.392
2006	96.345
2007	96.096
2008	95.946
2009	95.985
2010	95.861
2011	95.257
2012	95.003
2013	94.731
2014	94.724
2015	95.024
2016	94.96
2017	94.997
2018	94.981
2019	94.964
2020	94.946
2021	94.927
2022	94.91