Year	Percent
1990	90.143
1991	90.263
1992	90.101
1993	90.027
1994	89.907
1995	89.796
1996	89.714
1997	89.647
1998	89.569
1999	89.343
2000	89.036
2001	88.821
2002	88.581
2003	88.273
2004	87.947
2005	87.59
2006	87.279
2007	86.965
2008	86.665
2009	86.298
2010	85.913
2011	85.677
2012	85.356
2013	84.979
2014	84.612
2015	84.267
2016	83.987
2017	83.8
2018	83.621
2019	83.466
2020	83.343
2021	83.261
2022	83.21
2023	83.18
2024	83.151
2025	83.114
2026	83.081
2027	83.041
2028	82.992
2029	82.927
2030	82.843