Year	Percent
1991	90.246
1992	89.527
1993	89.272
1994	87.089
1995	87.568
1996	87.89
1997	88.96
1998	88.669
1999	88.402
2000	88.193
2001	87.667
2002	90.315
2003	87.905
2004	93.33
2005	93.203
2006	92.997
2007	92.551
2008	92.24
2009	93.66
2010	93.253
2011	92.138
2012	91.976
2013	92.306
2014	92.193
2015	91.979
2016	91.943
2017	91.931
2018	91.907
2019	91.882
2020	91.856
2021	91.831
2022	91.806