Year	Percent
1990	86.157
1991	86.065
1992	85.77
1993	85.591
1994	85.736
1995	85.872
1996	84.425
1997	83.878
1998	84.196
1999	83.332
2000	82.577
2001	81.806
2002	80.992
2003	82.72
2004	81.838
2005	82.15
2006	82.433
2007	83.349
2008	83.051
2009	82.726
2010	82.616
2011	82.621
2012	82.622
2013	82.276
2014	82.141
2015	82.044
2016	82.044
2017	82.429
2018	82.847
2019	83.249
2020	83.604
2021	83.958
2022	84.274
2023	84.555
2024	84.811
2025	85.046
2026	85.287
2027	85.511
2028	85.714
2029	85.895
2030	86.051