Year	Percent
1961	9.65
1962	9.65
1963	9.65
1964	9.65
1965	9.65
1966	9.65
1967	9.65
1968	9.65
1969	9.65
1970	9.65
1971	9.65
1972	9.65
1973	9.65
1974	9.65
1975	9.65
1976	9.65
1977	9.65
1978	9.65
1979	9.65
1980	9.65
1981	9.65
1982	9.65
1983	9.65
1984	9.65
1985	9.65
1986	9.65
1987	9.65
1988	9.65
1989	9.65
1990	9.65
1991	9.82
1992	9.99
1993	10.16
1994	10.33
1995	10.5
1996	10.67
1997	10.84
1998	11.01
1999	11.18
2000	11.35
2001	11.5
2002	11.65
2003	11.8
2004	11.95
2005	12.1
2006	12.25
2007	12.4
2008	12.55
2009	12.7
2010	12.85
2011	13
2012	13.15
2013	13.3
2014	13.45
2015	13.6
2016	13.75
2017	13.9
2018	14.05
2019	14.2
2020	14.35
2021	14.5