Year	Percent (Units)
1980	0.002
1981	0.002
1982	0.002
1983	0.002
1984	0.002
1985	0.002
1986	0.002
1987	0.002
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	0.003
1999	0.003
2000	0.004
2001	0.004
2002	0.004
2003	0.004
2004	0.004
2005	0.004
2006	0.004
2007	0.004
2008	0.004
2009	0.004
2010	0.003
2011	0.003
2012	0.003
2013	0.003
2014	0.003
2015	0.003
2016	0.003
2017	0.003
2018	0.003
2019	0.003
2020	0.002
2021	0.003
2022	0.003
2023	0.003
2024	0.003
2025	0.003
2026	0.003
2027	0.003
2028	0.003
2029	0.003