Year	Percent
1990	89.242
1991	89.25
1992	89.206
1993	88.375
1994	87.499
1995	86.579
1996	85.591
1997	84.55
1998	83.458
1999	82.316
2000	81.128
2001	79.896
2002	78.624
2003	77.978
2004	77.306
2005	76.617
2006	75.9
2007	75.167
2008	74.425
2009	73.683
2010	72.95
2011	73.764
2012	73.663
2013	73.508
2014	73.35
2015	73.244
2016	73.156
2017	73.142
2018	73.133
2019	73.125
2020	73.116
2021	73.106
2022	73.098
2023	73.09
2024	73.084
2025	73.081
2026	73.081
2027	73.083
2028	73.091
2029	73.107
2030	73.133