Year	Percent
1990	90.666
1991	90.832
1992	90.636
1993	90.753
1994	90.836
1995	90.858
1996	90.911
1997	90.916
1998	90.911
1999	90.888
2000	90.844
2001	91.306
2002	90.054
2003	89.784
2004	89.24
2005	88.645
2006	88.275
2007	88.666
2008	88.503
2009	89.409
2010	88.797
2011	87.782
2012	86.624
2013	86.457
2014	86.3
2015	86.167
2016	86.083
2017	85.913
2018	85.751
2019	85.597
2020	85.452
2021	85.313
2022	85.179
2023	85.05
2024	84.928
2025	84.812
2026	84.717
2027	84.629
2028	84.544
2029	84.456
2030	84.363