Year	Percent
1990	82.313
1991	82.482
1992	82.357
1993	82.439
1994	82.561
1995	82.701
1996	82.853
1997	83.064
1998	82.98
1999	82.865
2000	82.715
2001	83.049
2002	83.379
2003	83.702
2004	84.01
2005	84.303
2006	84.604
2007	83.519
2008	83.276
2009	83.386
2010	83.746
2011	83.971
2012	81.864
2013	81.566
2014	83.806
2015	81.719
2016	81.854
2017	81.908
2018	81.969
2019	82.035
2020	82.106
2021	82.187
2022	82.274
2023	82.364
2024	82.458
2025	82.555
2026	82.657
2027	82.762
2028	82.866
2029	82.959
2030	83.038