Year	Years
1970	-1.266
1971	-1.414
1972	-3.491
1973	-3.2
1974	-2.326
1975	-1.588
1976	-1.116
1977	-1.236
1978	-1.236
1979	-3.571
1980	-4.51
1981	-4.625
1982	-3.668
1983	-1.876
1984	-2.232
1985	-1.338
1986	-1.342
1987	-1.046
1988	0.304
1989	3.069
1990	2.925
1991	3.546
1992	3.83
1993	2.443
1994	1.809
1995	0.362
1996	0.1747
1997	0.5444
1998	-0.08209
1999	-0.2
2000	-0.04865
2001	-1.444
2002	-2.268
2003	0.07833