Year	Percent
1990	95.451
1991	95.531
1992	95.661
1993	96.022
1994	95.997
1995	95.894
1996	95.812
1997	95.755
1998	95.701
1999	95.68
2000	95.657
2001	95.641
2002	95.757
2003	95.717
2004	95.61
2005	95.419
2006	95.222
2007	94.989
2008	94.853
2009	94.869
2010	94.866
2011	94.873
2012	94.85
2013	94.795
2014	94.76
2015	94.744
2016	94.777
2017	94.729
2018	94.681
2019	94.633
2020	94.586
2021	94.537
2022	94.489
2023	94.44
2024	94.389
2025	94.335
2026	94.278
2027	94.22
2028	94.159
2029	94.099
2030	94.038