Year	Years
1970	0.3262
1971	0.5396
1972	-0.6658
1973	1.005
1974	1.932
1975	0.7813
1976	2.032
1977	1.547
1978	2.062
1979	2.124
1980	1.736
1981	2.732
1982	2.645
1983	2.804
1984	1.915
1985	2.764
1986	1.45
1987	1.339
1988	0.3572
1989	-0.2289
1990	-2.191
1991	-2.72
1992	-2.132
1993	-3.914
1994	-7.921
1995	-3.615
1996	-2.995
1997	-3.512
1998	-2.289
1999	-2.194
2000	0.1229
2001	0.5288
2002	1.004
2003	3.708