Year	Percent
1980	0.002
1981	0.002
1982	0.002
1983	0.002
1984	0.002
1985	0.002
1986	0.003
1987	0.003
1988	0.003
1989	0.003
1990	0.003
1991	0.003
1992	0.003
1993	0.003
1994	0.003
1995	0.003
1996	0.003
1997	0.003
1998	0.004
1999	0.004
2000	0.004
2001	0.004
2002	0.004
2003	0.005
2004	0.005
2005	0.004
2006	0.005
2007	0.005
2008	0.005
2009	0.005
2010	0.005
2011	0.005
2012	0.005
2013	0.005
2014	0.005
2015	0.005
2016	0.006
2017	0.006
2018	0.006
2019	0.006
2020	0.006
2021	0.006
2022	0.006
2023	0.007
2024	0.007