Year	Percent
1990	86.419
1991	86.453
1992	86.507
1993	86.597
1994	86.558
1995	86.526
1996	86.517
1997	86.472
1998	86.383
1999	86.404
2000	86.397
2001	86.43
2002	86.48
2003	86.582
2004	86.648
2005	86.67
2006	86.661
2007	86.597
2008	86.543
2009	86.537
2010	86.498
2011	86.454
2012	86.43
2013	86.416
2014	86.39
2015	86.347
2016	86.308
2017	86.26
2018	86.209
2019	86.162
2020	86.122
2021	86.088
2022	86.059
2023	86.037
2024	86.024
2025	86.022
2026	86.031
2027	86.051
2028	86.077
2029	86.1
2030	86.115