Year	Percent (Units)
1990	0.020
1991	0.020
1992	0.020
1993	0.019
1994	0.019
1995	0.019
1996	0.019
1997	0.019
1998	0.019
1999	0.019
2000	0.019
2001	0.019
2002	0.020
2003	0.020
2004	0.020
2005	0.020
2006	0.020
2007	0.019
2008	0.019
2009	0.019
2010	0.020
2011	0.020
2012	0.020
2013	0.021
2014	0.022
2015	0.022
2016	0.021
2017	0.020
2018	0.019
2019	0.019
2020	0.018
2021	0.017
2022	0.017
2023	0.017
2024	0.017
2025	0.017
2026	0.017
2027	0.017
2028	0.017
2029	0.017