Year	Percent
1990	97.392
1991	97.339
1992	97.432
1993	97.409
1994	97.292
1995	97.248
1996	97.122
1997	97.057
1998	96.262
1999	95.128
2000	95.441
2001	95.724
2002	95.98
2003	96.211
2004	96.423
2005	96.458
2006	96.484
2007	96.503
2008	96.513
2009	96.513
2010	96.506
2011	96.491
2012	96.416
2013	96.402
2014	96.392
2015	96.409
2016	96.414
2017	96.435
2018	96.454
2019	96.472
2020	96.489
2021	96.505
2022	96.52
2023	96.534
2024	96.548
2025	96.562
2026	96.575
2027	96.588
2028	96.602
2029	96.617
2030	96.633