Year	Percent
1990	95.794
1991	95.791
1992	95.768
1993	95.814
1994	95.868
1995	95.881
1996	95.967
1997	96.023
1998	96.05
1999	96.051
2000	96.035
2001	96.115
2002	96.215
2003	96.334
2004	96.254
2005	96.24
2006	96.198
2007	96.212
2008	96.303
2009	96.56
2010	96.71
2011	96.615
2012	96.558
2013	96.584
2014	96.594
2015	96.539
2016	96.413
2017	96.285
2018	96.162
2019	96.068
2020	96.018
2021	95.952
2022	95.916
2023	95.911
2024	95.934
2025	95.982
2026	96.005
2027	96.044
2028	96.098
2029	96.166
2030	96.245