Year	Percent
1990	90.644
1991	90.63
1992	90.64
1993	90.672
1994	90.721
1995	90.784
1996	90.745
1997	90.708
1998	90.669
1999	90.625
2000	90.324
2001	90.08
2002	89.807
2003	89.495
2004	89.138
2005	88.734
2006	88.305
2007	87.875
2008	87.441
2009	87.269
2010	87.082
2011	86.953
2012	86.81
2013	86.642
2014	86.438
2015	86.197
2016	85.986
2017	85.856
2018	85.756
2019	85.688
2020	85.652
2021	85.65
2022	85.679
2023	85.73
2024	85.795
2025	85.865
2026	85.944
2027	86.032
2028	86.119
2029	86.192
2030	86.244