Year	Percent
1990	84.641
1991	84.884
1992	85.087
1993	85.195
1994	85.269
1995	85.208
1996	85.245
1997	85.188
1998	85.119
1999	84.998
2000	84.9
2001	84.837
2002	84.69
2003	84.666
2004	84.588
2005	84.48
2006	84.428
2007	84.387
2008	84.217
2009	84.24
2010	84.172
2011	84.053
2012	83.915
2013	83.826
2014	83.806
2015	83.797
2016	83.584
2017	83.544
2018	83.508
2019	83.476
2020	83.447
2021	83.418
2022	83.392
2023	83.369
2024	83.348
2025	83.327
2026	83.304
2027	83.282
2028	83.261
2029	83.24
2030	83.219