Year	Percent
1990	92.15
1991	78.38
1992	85.216
1993	89.806
1994	91.678
1995	92.872
1996	93.055
1997	93.604
1998	94.08
1999	94.273
2000	93.956
2001	94.317
2002	94.605
2003	94.475
2004	94.316
2005	94.131
2006	94.352
2007	94.886
2008	94.342
2009	93.978
2010	94.473
2011	94.26
2012	94.022
2013	93.752
2014	93.593
2015	93.583
2016	93.586
2017	93.583
2018	93.59
2019	93.596
2020	93.594
2021	93.582
2022	93.56
2023	93.53
2024	93.494
2025	93.455
2026	93.409
2027	93.358
2028	93.3
2029	93.232
2030	93.156