Year	Years
1964	4.346
1965	7.151
1966	4.296
1967	4.283
1968	2.291
1969	1.487
1970	0.1471
1971	-1.292
1972	-0.8992
1973	-1.919
1974	-2.864
1975	-4.58
1976	-3.69
1977	-4.403
1978	-2.129
1979	-1.407
1980	0.4151
1981	0.5397
1982	0.9234
1983	1.861
1984	3.144
1985	4.449
1986	4.125
1987	4.537
1988	2.166
1989	-0.3959
1990	-2.22
1991	-2.172
1992	-2.728
1993	-2.886
1994	-3.166
1995	-2.863
1996	-3.479
1997	-2.992
1998	-2.341
1999	-0.4288
2000	0.983
2001	1.371
2002	1.489
2003	0.9289