Year	Percent
1990	92.731
1991	92.734
1992	92.774
1993	92.85
1994	92.908
1995	92.937
1996	92.022
1997	92.539
1998	90.841
1999	90.76
2000	90.845
2001	89.272
2002	86.955
2003	86.438
2004	86.929
2005	85.665
2006	87.059
2007	85.913
2008	85.891
2009	86.415
2010	90.84
2011	88.941
2012	89.891
2013	89.983
2014	90.533
2015	91.572
2016	90.943
2017	90.932
2018	90.913
2019	90.9
2020	90.901
2021	90.918
2022	90.949
2023	90.988
2024	91.025
2025	91.056
2026	91.083
2027	91.104
2028	91.123
2029	91.147
2030	91.181