Year	Percent
1990	97.255
1991	97.256
1992	97.259
1993	97.263
1994	97.268
1995	97.273
1996	97.262
1997	97.253
1998	97.247
1999	97.24
2000	97.083
2001	96.916
2002	96.742
2003	96.562
2004	96.377
2005	96.187
2006	95.977
2007	95.754
2008	95.516
2009	95.488
2010	95.457
2011	95.446
2012	95.433
2013	95.414
2014	95.384
2015	95.342
2016	95.299
2017	95.223
2018	95.145
2019	95.065
2020	94.982
2021	94.897
2022	94.81
2023	94.725
2024	94.645
2025	94.572
2026	94.505
2027	94.445
2028	94.391
2029	94.343
2030	94.298