Year	Years
1970	-1.818
1971	-1.612
1972	-1.51
1973	-1.917
1974	-1.627
1975	-1.223
1976	-0.5117
1977	-0.6913
1978	-1.261
1979	0.2519
1980	-0.5621
1981	-0.756
1982	0.3977
1983	1.054
1984	0.02447
1985	0.1286
1986	-0.7345
1987	0.06406
1988	0.6281
1989	-0.1568
1990	0.1905
1991	0.4475
1992	-0.9108
1993	-1.286
1994	-0.2748
1995	-0.9769
1996	-0.794
1997	-0.4173
1998	-0.739
1999	0.2389
2000	0.8682
2001	-0.1587
2002	-0.1014
2003	0.5671