Year	Percent
1990	93.034
1991	93.037
1992	93.054
1993	93.065
1994	93.069
1995	93.075
1996	92.224
1997	91.967
1998	92.925
1999	90.615
2000	91.675
2001	89.432
2002	88.43
2003	88.674
2004	89.064
2005	88.404
2006	92.626
2007	93.496
2008	92.76
2009	91.889
2010	91.815
2011	92.087
2012	92.088
2013	92.348
2014	92.184
2015	92.654
2016	93.678
2017	93.754
2018	93.831
2019	93.9
2020	93.959
2021	94.01
2022	94.051
2023	94.084
2024	94.114
2025	94.14
2026	94.165
2027	94.185
2028	94.202
2029	94.214
2030	94.221