Year	Percent
1990	85.084
1991	85.28
1992	85.371
1993	85.395
1994	85.418
1995	85.461
1996	85.51
1997	85.565
1998	85.612
1999	85.634
2000	85.625
2001	85.626
2002	85.611
2003	85.587
2004	85.565
2005	85.55
2006	85.548
2007	85.552
2008	85.56
2009	85.57
2010	85.582
2011	85.6
2012	85.618
2013	85.513
2014	85.525
2015	85.371
2016	85.338
2017	85.366
2018	85.391
2019	85.412
2020	85.427
2021	85.443
2022	85.454
2023	85.462
2024	85.468
2025	85.474
2026	85.484
2027	85.494
2028	85.504
2029	85.515
2030	85.529