Year	Years
1964	1.486
1965	1.445
1966	0.3448
1967	-0.2351
1968	-1.42
1969	0.6715
1970	2.38
1971	2.908
1972	3.575
1973	3.95
1974	4.72
1975	3.761
1976	3.476
1977	2.3
1978	4.103
1979	2.666
1980	1.142
1981	1.861
1982	1.08
1983	1.407
1984	-1.356
1985	-0.9943
1986	-0.7411
1987	-0.01955
1988	0.3488
1989	0.7355
1990	0.6659
1991	0.1855
1992	-1.345
1993	-2.106
1994	0.2241
1995	-0.6155
1996	0.3953
1997	1.159
1998	0.3215
1999	-0.5673
2000	-0.5717
2001	-2.131
2002	-1.642
2003	-2.288