Year	Percent
1990	86.457
1991	86.229
1992	86.002
1993	86.023
1994	85.941
1995	85.574
1996	85.178
1997	84.757
1998	85.419
1999	86.046
2000	86.642
2001	86.674
2002	86.703
2003	86.729
2004	86.753
2005	86.774
2006	86.798
2007	86.821
2008	86.838
2009	86.845
2010	86.839
2011	86.829
2012	86.81
2013	86.786
2014	86.763
2015	86.495
2016	86.5
2017	86.52
2018	86.547
2019	86.582
2020	86.627
2021	86.679
2022	86.739
2023	86.802
2024	86.865
2025	86.924
2026	86.979
2027	87.029
2028	87.073
2029	87.113
2030	87.147