Year	Percent
1990	93.606
1991	93.683
1992	93.803
1993	93.89
1994	93.968
1995	94.02
1996	94.057
1997	94.079
1998	94.085
1999	94.067
2000	94.028
2001	93.97
2002	93.895
2003	93.813
2004	93.733
2005	93.668
2006	93.615
2007	93.567
2008	93.527
2009	93.493
2010	93.465
2011	93.444
2012	93.428
2013	93.422
2014	93.425
2015	93.437
2016	93.46
2017	93.484
2018	93.511
2019	93.534
2020	93.55
2021	93.561
2022	93.564
2023	93.562
2024	93.554
2025	93.541
2026	93.526
2027	93.506
2028	93.48
2029	93.443
2030	93.397