Year	Percent
1990	96.418
1991	96.418
1992	96.401
1993	96.545
1994	96.682
1995	96.81
1996	96.931
1997	97.044
1998	97.058
1999	97.068
2000	97.354
2001	97.601
2002	97.82
2003	98.017
2004	98.195
2005	98.357
2006	97.992
2007	97.53
2008	96.945
2009	97.034
2010	96.933
2011	96.936
2012	96.937
2013	96.934
2014	97.136
2015	96.655
2016	94.765
2017	94.758
2018	94.75
2019	94.742
2020	94.735
2021	94.729
2022	94.724
2023	94.719
2024	94.714
2025	94.709
2026	94.705
2027	94.7
2028	94.696
2029	94.693
2030	94.69