Year	Percent
1990	96.734
1991	96.701
1992	96.808
1993	96.699
1994	96.818
1995	96.658
1996	96.614
1997	96.616
1998	96.619
1999	96.538
2000	96.453
2001	96.366
2002	96.275
2003	96.18
2004	96.085
2005	95.989
2006	95.894
2007	95.793
2008	95.684
2009	95.564
2010	95.433
2011	95.288
2012	95.129
2013	94.956
2014	94.855
2015	94.799
2016	94.738
2017	94.708
2018	94.677
2019	94.644
2020	94.609
2021	94.573
2022	94.534
2023	94.494
2024	94.454
2025	94.414
2026	94.373
2027	94.332
2028	94.29
2029	94.248
2030	94.206