Year	Percent (Units)
1992	0.027
1993	0.023
1994	0.018
1995	0.017
1996	0.017
1997	0.018
1998	0.018
1999	0.018
2000	0.018
2001	0.019
2002	0.018
2003	0.019
2004	0.019
2005	0.018
2006	0.018
2007	0.018
2008	0.019
2009	0.020
2010	0.019
2011	0.019
2012	0.020
2013	0.022
2014	0.023
2015	0.022
2016	0.024
2017	0.025
2018	0.025
2019	0.026
2020	0.025
2021	0.025
2022	0.025
2023	0.026
2024	0.026
2025	0.026
2026	0.026
2027	0.027
2028	0.027
2029	0.027