Year	Percent
1991	91.678
1992	92.012
1993	92.926
1994	92.931
1995	93.134
1996	93.028
1997	93.158
1998	93.417
1999	93.258
2000	92.965
2001	93.502
2002	93.248
2003	92.969
2004	92.739
2005	91.478
2006	91.02
2007	90.968
2008	91.093
2009	91.004
2010	90.657
2011	90.117
2012	89.59
2013	88.818
2014	88.931
2015	90.1
2016	90.014
2017	90.004
2018	89.969
2019	89.936
2020	89.898
2021	89.86
2022	89.823