Year	Percent
1990	97.792
1991	97.738
1992	97.681
1993	97.621
1994	97.552
1995	97.474
1996	97.387
1997	97.29
1998	97.181
1999	97.058
2000	96.918
2001	96.771
2002	96.611
2003	96.446
2004	96.288
2005	96.141
2006	96.007
2007	95.881
2008	95.756
2009	95.617
2010	95.455
2011	95.387
2012	95.321
2013	95.252
2014	95.184
2015	95.119
2016	95.061
2017	94.983
2018	94.915
2019	94.853
2020	94.795
2021	94.744
2022	94.696
2023	94.653
2024	94.613
2025	94.576
2026	94.543
2027	94.51
2028	94.475
2029	94.429
2030	94.368