Year	Percent
1990	85.984
1991	85.774
1992	85.559
1993	85.331
1994	85.23
1995	85.233
1996	85.1
1997	84.982
1998	84.947
1999	84.91
2000	84.845
2001	84.735
2002	84.69
2003	84.678
2004	84.687
2005	84.701
2006	84.619
2007	84.58
2008	84.563
2009	84.529
2010	84.538
2011	84.479
2012	84.453
2013	84.466
2014	84.514
2015	84.577
2016	84.567
2017	84.539
2018	84.511
2019	84.484
2020	84.458
2021	84.432
2022	84.408
2023	84.383
2024	84.357
2025	84.329
2026	84.299
2027	84.267
2028	84.234
2029	84.201
2030	84.168