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	0.003
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	0.003
1999	0.003
2000	0.003
2001	0.003
2002	0.004
2003	0.004
2004	0.004
2005	0.004
2006	0.004
2007	0.004
2008	0.005
2009	0.005
2010	0.005
2011	0.005
2012	0.006
2013	0.006
2014	0.006
2015	0.006
2016	0.007
2017	0.007
2018	0.007
2019	0.007
2020	0.007
2021	0.006
2022	0.006
2023	0.007
2024	0.007
2025	0.007
2026	0.007
2027	0.007
2028	0.007
2029	0.007