Year	Percent
1990	93.696
1991	93.858
1992	93.699
1993	93.688
1994	93.559
1995	93.519
1996	93.382
1997	92.953
1998	92.493
1999	92
2000	91.469
2001	90.922
2002	90.338
2003	89.716
2004	89.054
2005	88.348
2006	87.582
2007	86.774
2008	88.096
2009	89.309
2010	90.421
2011	91.429
2012	92.344
2013	93.174
2014	93.92
2015	93.695
2016	93.645
2017	93.688
2018	93.73
2019	93.772
2020	93.815
2021	93.858
2022	93.902
2023	93.943
2024	93.979
2025	94.007
2026	94.03
2027	94.048
2028	94.06
2029	94.071
2030	94.082