Year	Percent
1990	96.587
1991	96.62
1992	96.645
1993	96.669
1994	96.673
1995	96.688
1996	96.711
1997	96.729
1998	96.739
1999	96.76
2000	96.767
2001	96.786
2002	96.793
2003	96.798
2004	96.797
2005	96.793
2006	96.785
2007	96.773
2008	96.766
2009	96.766
2010	96.745
2011	96.727
2012	96.703
2013	96.675
2014	96.648
2015	96.623
2016	96.609
2017	96.604
2018	96.6
2019	96.595
2020	96.59
2021	96.585
2022	96.58
2023	96.575
2024	96.574
2025	96.578
2026	96.586
2027	96.597
2028	96.61
2029	96.62
2030	96.627