"year"	"rate"
1976	15.99
1977	15.44
1978	15.54
1979	15.5
1980	15.36
1981	14.49
1982	14.02
1983	13.47
1984	12.7
1985	11.73
1986	11.32
1987	10.64
1988	10.71
1989	10.08
