Year	Percent
1990	96.162
1991	96.151
1992	96.126
1993	96.135
1994	96.163
1995	96.16
1996	96.091
1997	95.998
1998	95.981
1999	96.035
2000	96.046
2001	95.919
2002	95.85
2003	95.812
2004	95.731
2005	95.65
2006	95.614
2007	95.628
2008	95.623
2009	95.705
2010	95.849
2011	96.05
2012	96.113
2013	96.217
2014	96.305
2015	96.324
2016	96.362
2017	96.385
2018	96.412
2019	96.433
2020	96.442
2021	96.375
2022	96.298
2023	96.221
2024	96.159
2025	96.118
2026	96.051
2027	95.995
2028	95.942
2029	95.881
2030	95.812