Year	Percent
1990	96.81
1991	96.898
1992	97.087
1993	97.194
1994	97.265
1995	97.322
1996	97.329
1997	97.328
1998	97.259
1999	97.284
2000	97.328
2001	97.31
2002	97.314
2003	97.296
2004	97.323
2005	97.321
2006	97.315
2007	97.33
2008	97.292
2009	97.335
2010	97.298
2011	97.308
2012	97.231
2013	97.203
2014	97.161
2015	97.154
2016	97.15
2017	97.161
2018	97.171
2019	97.172
2020	97.162
2021	97.143
2022	97.117
2023	97.088
2024	97.062
2025	97.041
2026	97.025
2027	97.014
2028	97.008
2029	97.008
2030	97.013