Year	Percent
1990	96.832
1991	96.994
1992	97.021
1993	96.823
1994	96.049
1995	96.274
1996	95.948
1997	96.415
1998	96.026
1999	97.497
2000	96.54
2001	95.962
2002	96.711
2003	95.96
2004	95.015
2005	93.828
2006	94.743
2007	94.651
2008	94.26
2009	92.726
2010	92.638
2011	91.988
2012	91.489
2013	92.172
2014	93.571
2015	94.455
2016	95.33
2017	95.006
2018	94.677
2019	94.35
2020	94.032
2021	93.723
2022	93.425
2023	93.136
2024	92.847
2025	92.552
2026	92.252
2027	91.946
2028	91.634
2029	91.321
2030	91.007