Year	Percent
1990	93.432
1991	93.46
1992	93.572
1993	93.665
1994	93.659
1995	93.763
1996	93.707
1997	93.747
1998	93.694
1999	93.675
2000	93.628
2001	93.495
2002	93.391
2003	93.229
2004	93.283
2005	92.835
2006	92.978
2007	93.118
2008	93.256
2009	93.738
2010	94.162
2011	94.539
2012	94.306
2013	94.446
2014	94.423
2015	94.349
2016	94.365
2017	94.462
2018	94.561
2019	94.66
2020	94.757
2021	94.853
2022	94.946
2023	95.036
2024	95.119
2025	95.196
2026	95.266
2027	95.329
2028	95.387
2029	95.44
2030	95.489