Year	Percent
1980	0.007
1981	0.008
1982	0.007
1983	0.007
1984	0.007
1985	0.007
1986	0.007
1987	0.007
1988	0.007
1989	0.007
1990	0.007
1991	0.007
1992	0.006
1993	0.006
1994	0.006
1995	0.006
1996	0.005
1997	0.006
1998	0.006
1999	0.006
2000	0.005
2001	0.005
2002	0.005
2003	0.005
2004	0.004
2005	0.004
2006	0.004
2007	0.004
2008	0.004
2009	0.004
2010	0.004
2011	0.004
2012	0.004
2013	0.003
2014	0.003
2015	0.003
2016	0.003
2017	0.003
2018	0.003
2019	0.003
2020	0.003
2021	0.003
2022	0.003
2023	0.003
2024	0.003