Year	Percent
1990	96.302
1991	96.207
1992	96.118
1993	96.054
1994	95.994
1995	95.909
1996	95.999
1997	96.083
1998	96.161
1999	96.231
2000	96.291
2001	96.332
2002	96.102
2003	95.847
2004	95.571
2005	95.237
2006	94.751
2007	94.807
2008	94.977
2009	94.983
2010	94.926
2011	94.685
2012	94.338
2013	94.221
2014	94.081
2015	93.918
2016	94.491
2017	94.378
2018	94.266
2019	94.158
2020	94.054
2021	93.956
2022	93.865
2023	93.776
2024	93.683
2025	93.581
2026	93.473
2027	93.359
2028	93.247
2029	93.141
2030	93.047