Year	Percent
1990	93.506
1991	93.59
1992	93.692
1993	93.789
1994	93.88
1995	93.936
1996	93.952
1997	93.966
1998	93.94
1999	93.9
2000	93.863
2001	93.822
2002	93.777
2003	93.729
2004	93.682
2005	93.639
2006	93.607
2007	93.583
2008	93.572
2009	93.558
2010	93.551
2011	93.559
2012	93.566
2013	93.576
2014	93.594
2015	93.611
2016	93.634
2017	93.648
2018	93.663
2019	93.682
2020	93.704
2021	93.731
2022	93.761
2023	93.79
2024	93.809
2025	93.814
2026	93.808
2027	93.788
2028	93.759
2029	93.728
2030	93.698