Year	Percent
1990	95.422
1991	95.288
1992	95.135
1993	95.051
1994	94.963
1995	95.022
1996	94.933
1997	94.792
1998	94.726
1999	94.813
2000	94.847
2001	94.95
2002	95.149
2003	95.049
2004	94.931
2005	95.112
2006	94.805
2007	94.651
2008	94.469
2009	94.197
2010	94.012
2011	94.735
2012	94.46
2013	94.199
2014	94.097
2015	94.06
2016	94.167
2017	94.125
2018	94.084
2019	94.042
2020	93.999
2021	93.957
2022	93.914
2023	93.87
2024	93.824
2025	93.775
2026	93.723
2027	93.668
2028	93.613
2029	93.561
2030	93.512