Year	Percent
1980	0.011
1981	0.011
1982	0.01
1983	0.01
1984	0.01
1985	0.01
1986	0.01
1987	0.01
1988	0.01
1989	0.01
1990	0.009
1991	0.009
1992	0.007
1993	0.007
1994	0.007
1995	0.007
1996	0.007
1997	0.007
1998	0.007
1999	0.007
2000	0.007
2001	0.007
2002	0.006
2003	0.006
2004	0.006
2005	0.006
2006	0.006
2007	0.006
2008	0.006
2009	0.005
2010	0.005
2011	0.005
2012	0.005
2013	0.004
2014	0.004
2015	0.004
2016	0.004
2017	0.004
2018	0.004
2019	0.004
2020	0.004
2021	0.004
2022	0.004
2023	0.003
2024	0.003