Year	Percent (Units)
1980	0.005
1981	0.005
1982	0.006
1983	0.006
1984	0.006
1985	0.006
1986	0.006
1987	0.006
1988	0.005
1989	0.005
1990	0.006
1991	0.005
1992	0.005
1993	0.005
1994	0.005
1995	0.005
1996	0.005
1997	0.005
1998	0.005
1999	0.005
2000	0.005
2001	0.005
2002	0.005
2003	0.005
2004	0.005
2005	0.005
2006	0.004
2007	0.004
2008	0.004
2009	0.005
2010	0.005
2011	0.004
2012	0.004
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	0.004
2024	0.004
2025	0.004
2026	0.005
2027	0.005
2028	0.005
2029	0.005