Year	Percent
1990	92.51
1991	92.536
1992	92.541
1993	92.545
1994	92.544
1995	92.535
1996	92.519
1997	92.493
1998	92.459
1999	92.42
2000	92.38
2001	92.339
2002	92.322
2003	92.319
2004	92.324
2005	92.302
2006	92.303
2007	92.278
2008	92.267
2009	92.24
2010	92.204
2011	92.183
2012	92.153
2013	92.129
2014	92.108
2015	92.099
2016	92.088
2017	92.075
2018	92.065
2019	92.06
2020	92.062
2021	92.073
2022	92.092
2023	92.113
2024	92.131
2025	92.142
2026	92.151
2027	92.154
2028	92.152
2029	92.145
2030	92.136