Year	Percent
1990	96.87
1991	96.857
1992	96.855
1993	96.574
1994	96.27
1995	95.942
1996	95.585
1997	95.198
1998	94.774
1999	94.306
2000	93.79
2001	93.221
2002	92.596
2003	92.991
2004	93.34
2005	93.649
2006	93.923
2007	94.165
2008	94.378
2009	94.565
2010	94.728
2011	95.041
2012	94.98
2013	94.873
2014	94.771
2015	94.736
2016	94.675
2017	94.726
2018	94.777
2019	94.831
2020	94.888
2021	94.945
2022	95.005
2023	95.068
2024	95.133
2025	95.2
2026	95.268
2027	95.337
2028	95.408
2029	95.478
2030	95.547