Year	Years
1970	-1.592
1971	-0.8373
1972	-0.2249
1973	-1.657
1974	1.061
1975	1.089
1976	1.567
1977	2.363
1978	2.102
1979	2.574
1980	2.026
1981	0.9172
1982	0.07134
1983	1.619
1984	1.408
1985	0.6286
1986	1.796
1987	1.411
1988	0.7989
1989	0.9415
1990	0.5399
1991	1.367
1992	2.532
1993	2.437
1994	1.984
1995	2.27
1996	1.417
1997	1.262
1998	2.908
1999	2.499
2000	1.938
2001	2.886
2002	2.117
2003	2.239
2004	2.527