Year	Percent
1990	96.847
1991	96.851
1992	96.608
1993	96.394
1994	96.137
1995	94.786
1996	95.23
1997	96.183
1998	95.472
1999	95.227
2000	95.149
2001	95.165
2002	95.178
2003	94.994
2004	95.189
2005	95.288
2006	95.341
2007	95.252
2008	94.889
2009	94.637
2010	94.217
2011	94.265
2012	94.555
2013	94.372
2014	94.3
2015	94.294
2016	94.293
2017	94.227
2018	94.16
2019	94.091
2020	94.021
2021	93.949
2022	93.877
2023	93.804
2024	93.736
2025	93.674
2026	93.617
2027	93.565
2028	93.515
2029	93.467
2030	93.417