Year	Percent
1990	95.055
1991	95.115
1992	95.148
1993	95.209
1994	95.254
1995	95.254
1996	95.241
1997	95.01
1998	94.767
1999	94.507
2000	94.229
2001	93.928
2002	93.602
2003	93.255
2004	92.897
2005	92.532
2006	92.163
2007	91.788
2008	91.404
2009	91.006
2010	91.799
2011	91.38
2012	90.926
2013	92.094
2014	88.742
2015	88.726
2016	88.701
2017	88.656
2018	88.61
2019	88.564
2020	88.517
2021	88.472
2022	88.427
2023	88.377
2024	88.316
2025	88.239
2026	88.148
2027	88.043
2028	87.926
2029	87.797
2030	87.659