Date	Rate(%)
1970	2.12
1972	5.29
1974	6.01
1976	8.51
1978	7.19
1980	9.28
1982	9.37
1984	8.84
1986	8.09
1988	7.63
1990	8.04
1992	9.96
1994	10.55
1996	9.63
1998	7.32
2000	6.09
2002	6.64
2004	8.13
2006	8.9
2008	9.28
2010	13.03
2012	14.85
2014	14.59