Year	Percent
1991	92.056
1992	91.728
1993	91.881
1994	92.223
1995	92.575
1996	92.426
1997	91.592
1998	91.052
1999	90.823
2000	90.683
2001	90.231
2002	90.582
2003	91.39
2004	92.272
2005	93.316
2006	92.148
2007	92.405
2008	93.403
2009	94.652
2010	95.65
2011	94.412
2012	93.868
2013	93.888
2014	94.34
2015	94.994
2016	94.686
2017	94.531
2018	94.61
2019	94.927
2020	95.376
2021	94.938
2022	94.579