Year	Percent
1990	81.466
1991	81.29
1992	81.176
1993	81.067
1994	81.129
1995	81.276
1996	81.361
1997	81.519
1998	81.725
1999	81.951
2000	82.185
2001	82.327
2002	82.473
2003	82.622
2004	82.769
2005	82.901
2006	82.941
2007	83.008
2008	83.086
2009	83.159
2010	83.247
2011	83.284
2012	83.349
2013	83.447
2014	83.58
2015	83.747
2016	83.891
2017	84.019
2018	84.15
2019	84.281
2020	84.412
2021	84.546
2022	84.678
2023	84.808
2024	84.933
2025	85.051
2026	85.164
2027	85.272
2028	85.375
2029	85.477
2030	85.577