Year	Percent
1991	86.411
1992	86.541
1993	86.588
1994	86.732
1995	86.951
1996	86.687
1997	87.201
1998	87.76
1999	87.996
2000	88.318
2001	88.596
2002	89.164
2003	89.129
2004	89.921
2005	90.36
2006	90.595
2007	90.634
2008	90.83
2009	91.717
2010	91.954
2011	91.654
2012	91.649
2013	91.679
2014	91.54
2015	91.869
2016	92.079
2017	92.106
2018	92.137
2019	92.151
2020	92.208
2021	92.258
2022	92.293