Year	Percent
1991	86.133
1992	86.814
1993	86.719
1994	87.95
1995	87.696
1996	87.975
1997	88.175
1998	87.527
1999	88.019
2000	88.161
2001	88.631
2002	89.064
2003	89.736
2004	89.781
2005	89.314
2006	89.753
2007	90.32
2008	90.873
2009	91.3
2010	91.52
2011	91.94
2012	91.954
2013	92.641
2014	92.607
2015	92.446
2016	92.439
2017	92.452
2018	92.62
2019	92.793
2020	92.882
2021	92.977
2022	93.06