Year	Percent
1990	96.713
1991	96.79
1992	96.851
1993	96.955
1994	96.946
1995	96.908
1996	96.871
1997	96.819
1998	96.764
1999	96.711
2000	96.656
2001	96.61
2002	96.568
2003	96.524
2004	96.483
2005	96.456
2006	96.438
2007	96.414
2008	96.394
2009	96.386
2010	96.365
2011	96.347
2012	96.323
2013	96.285
2014	96.241
2015	96.194
2016	96.17
2017	96.165
2018	96.161
2019	96.158
2020	96.154
2021	96.15
2022	96.146
2023	96.14
2024	96.13
2025	96.116
2026	96.097
2027	96.074
2028	96.049
2029	96.021
2030	95.992