Year	Percent
1990	99.306
1991	99.306
1992	99.292
1993	99.292
1994	99.289
1995	99.287
1996	99.274
1997	99.227
1998	99.198
1999	99.179
2000	99.152
2001	99.137
2002	99.118
2003	99.114
2004	99.086
2005	99.099
2006	99.131
2007	99.167
2008	99.256
2009	99.325
2010	99.326
2011	99.306
2012	99.377
2013	99.437
2014	99.485
2015	99.526
2016	99.525
2017	99.529
2018	99.532
2019	99.535
2020	99.54
2021	99.552
2022	99.564
2023	99.575
2024	99.586
2025	99.596
2026	99.608
2027	99.618
2028	99.627
2029	99.635
2030	99.643