Year	Percent
1990	96.94
1991	96.963
1992	96.993
1993	96.946
1994	97.031
1995	97.013
1996	96.979
1997	96.962
1998	96.981
1999	96.955
2000	96.936
2001	96.935
2002	96.936
2003	96.914
2004	96.889
2005	96.86
2006	96.864
2007	96.866
2008	96.867
2009	96.865
2010	96.86
2011	96.855
2012	96.849
2013	96.801
2014	96.751
2015	96.715
2016	96.682
2017	96.675
2018	96.667
2019	96.658
2020	96.648
2021	96.638
2022	96.627
2023	96.615
2024	96.604
2025	96.594
2026	96.584
2027	96.575
2028	96.566
2029	96.557
2030	96.55