Year	Percent
1990	93.858
1991	93.909
1992	93.936
1993	93.998
1994	94.044
1995	94.391
1996	94.715
1997	95.013
1998	94.701
1999	94.358
2000	93.976
2001	93.557
2002	93.097
2003	92.599
2004	92.072
2005	91.516
2006	91.976
2007	92.377
2008	92.918
2009	93.192
2010	92.595
2011	93.388
2012	92.394
2013	92.359
2014	92.335
2015	92.36
2016	92.387
2017	92.4
2018	92.419
2019	92.44
2020	92.46
2021	92.481
2022	92.5
2023	92.516
2024	92.523
2025	92.519
2026	92.506
2027	92.482
2028	92.447
2029	92.403
2030	92.35