Year	Percent
1990	85.673
1991	85.55
1992	85.715
1993	84.825
1994	85.88
1995	86.31
1996	85.875
1997	85.48
1998	85.093
1999	84.974
2000	84.771
2001	85.485
2002	84.342
2003	83.056
2004	83.098
2005	83.104
2006	85.309
2007	85.084
2008	85.331
2009	85.578
2010	85.66
2011	85.641
2012	84.975
2013	84.841
2014	84.802
2015	84.044
2016	83.468
2017	83.653
2018	83.833
2019	84.009
2020	84.18
2021	84.355
2022	84.522
2023	84.682
2024	84.841
2025	85.004
2026	85.178
2027	85.355
2028	85.526
2029	85.682
2030	85.82