Year	Percent (Units)
1980	0.008
1981	0.008
1982	0.008
1983	0.008
1984	0.008
1985	0.007
1986	0.009
1987	0.009
1988	0.009
1989	0.010
1990	0.010
1991	0.010
1992	0.010
1993	0.010
1994	0.010
1995	0.010
1996	0.010
1997	0.010
1998	0.010
1999	0.010
2000	0.009
2001	0.009
2002	0.009
2003	0.009
2004	0.009
2005	0.009
2006	0.009
2007	0.009
2008	0.009
2009	0.009
2010	0.009
2011	0.009
2012	0.009
2013	0.009
2014	0.009
2015	0.009
2016	0.008
2017	0.008
2018	0.008
2019	0.008
2020	0.008
2021	0.008
2022	0.008
2023	0.008
2024	0.008
2025	0.008
2026	0.008
2027	0.008
2028	0.008
2029	0.008