Year	Percent
1990	83.233
1991	83.014
1992	82.53
1993	82.614
1994	83.116
1995	83.643
1996	83.939
1997	83.976
1998	83.349
1999	82.967
2000	83.066
2001	83.284
2002	83.939
2003	83.025
2004	83.727
2005	84.373
2006	84.944
2007	84.825
2008	84.196
2009	83.52
2010	83.166
2011	83.163
2012	82.642
2013	82.716
2014	83.83
2015	83.934
2016	84.984
2017	85.04
2018	85.094
2019	85.126
2020	85.123
2021	85.084
2022	85.004
2023	84.9
2024	84.804
2025	84.735
2026	84.689
2027	84.666
2028	84.658
2029	84.648
2030	84.625