Year	Percent
1990	97.881
1991	97.785
1992	97.641
1993	97.409
1994	97.051
1995	96.48
1996	97.367
1997	97.152
1998	96.913
1999	96.65
2000	96.357
2001	96.031
2002	95.667
2003	95.263
2004	94.817
2005	94.325
2006	93.785
2007	93.914
2008	94.041
2009	94.167
2010	94.291
2011	94.411
2012	94.526
2013	94.634
2014	94.732
2015	94.736
2016	94.739
2017	94.699
2018	94.656
2019	94.609
2020	94.557
2021	94.502
2022	94.442
2023	94.38
2024	94.315
2025	94.249
2026	94.182
2027	94.115
2028	94.046
2029	93.976
2030	93.904