Year	Percent
1990	84.234
1991	84.089
1992	83.826
1993	83.768
1994	83.924
1995	84.266
1996	84.421
1997	84.213
1998	84.071
1999	84.021
2000	84.059
2001	84.047
2002	84.071
2003	84.099
2004	84.096
2005	84.046
2006	84.321
2007	84.512
2008	84.64
2009	84.718
2010	84.76
2011	85.4
2012	85.763
2013	85.056
2014	84.274
2015	83.392
2016	83.549
2017	83.685
2018	83.836
2019	84.007
2020	84.198
2021	84.38
2022	84.577
2023	84.776
2024	84.959
2025	85.112
2026	85.225
2027	85.313
2028	85.382
2029	85.434
2030	85.475