Year	Percent
1990	82.045
1991	82.134
1992	82.347
1993	83.016
1994	83.923
1995	84.854
1996	84.042
1997	83.321
1998	82.848
1999	82.699
2000	82.827
2001	82.457
2002	82.568
2003	83.06
2004	83.407
2005	83.957
2006	83.592
2007	83.562
2008	83.947
2009	85.022
2010	85.933
2011	86.148
2012	86.31
2013	86.58
2014	86.782
2015	86.835
2016	86.061
2017	85.57
2018	85.327
2019	85.263
2020	85.298
2021	84.788
2022	84.391
2023	84.132
2024	84.012
2025	83.994
2026	83.616
2027	83.3
2028	83.089
2029	83.012
2030	83.058