Year	Percent
1990	95.343
1991	94.719
1992	94.212
1993	94.691
1994	95.064
1995	95.85
1996	93.534
1997	95.103
1998	95.02
1999	94.922
2000	94.812
2001	94.698
2002	94.575
2003	94.443
2004	94.898
2005	94.609
2006	94.29
2007	93.94
2008	93.557
2009	93.141
2010	92.808
2011	92.634
2012	93.156
2013	92.927
2014	90.891
2015	91.669
2016	91.756
2017	91.637
2018	91.518
2019	91.401
2020	91.284
2021	91.163
2022	91.042
2023	90.921
2024	90.8
2025	90.681
2026	90.561
2027	90.444
2028	90.329
2029	90.215
2030	90.102