Year	Percent
1990	97.579
1991	97.584
1992	97.586
1993	97.587
1994	97.591
1995	97.591
1996	97.59
1997	97.588
1998	97.587
1999	97.588
2000	97.043
2001	96.297
2002	96.158
2003	96.008
2004	95.85
2005	95.682
2006	95.802
2007	95.881
2008	95.958
2009	96.033
2010	94.78
2011	94.18
2012	93.48
2013	94.12
2014	94.681
2015	95.023
2016	95.028
2017	94.887
2018	94.747
2019	94.607
2020	94.469
2021	94.334
2022	94.2
2023	94.068
2024	93.937
2025	93.806
2026	93.677
2027	93.549
2028	93.422
2029	93.297
2030	93.176