Year	Percent
1990	85.909
1991	85.877
1992	85.856
1993	85.833
1994	85.809
1995	85.8
1996	85.823
1997	85.853
1998	85.882
1999	85.909
2000	85.93
2001	85.969
2002	85.947
2003	85.966
2004	85.962
2005	85.944
2006	86.705
2007	87.377
2008	87.96
2009	88.45
2010	88.843
2011	88.524
2012	88.15
2013	87.211
2014	86.145
2015	84.928
2016	84.837
2017	85.049
2018	85.27
2019	85.495
2020	85.719
2021	85.943
2022	86.166
2023	86.386
2024	86.604
2025	86.818
2026	87.031
2027	87.239
2028	87.44
2029	87.631
2030	87.81