Year	Percent
1980	0.008
1981	0.008
1982	0.008
1983	0.008
1984	0.008
1985	0.008
1986	0.009
1987	0.01
1988	0.01
1989	0.01
1990	0.011
1991	0.011
1992	0.01
1993	0.01
1994	0.01
1995	0.01
1996	0.01
1997	0.01
1998	0.01
1999	0.01
2000	0.01
2001	0.01
2002	0.01
2003	0.01
2004	0.01
2005	0.01
2006	0.01
2007	0.01
2008	0.01
2009	0.01
2010	0.01
2011	0.009
2012	0.01
2013	0.01
2014	0.01
2015	0.009
2016	0.009
2017	0.009
2018	0.009
2019	0.009
2020	0.008
2021	0.008
2022	0.008
2023	0.008
2024	0.008