Year	Years
1965	3.597
1966	3.068
1967	2.075
1968	3.219
1969	1.536
1970	3.42
1971	2.948
1972	4.976
1973	4.784
1974	2.591
1975	1.43
1976	3.072
1977	1.545
1978	1.773
1979	3.685
1980	1.175
1981	1.529
1982	0.3847
1983	0.7595
1984	1.23
1985	-0.1069
1986	-2.189
1987	-1.009
1988	-0.9509
1989	-0.4647
1990	-1.424
1991	-1.43
1992	-1.899
1993	-2.755
1994	-3.543
1995	-3.871
1996	-2.986
1997	-3.293
1998	-3.561
1999	-4.015
2000	-2.516
2001	-2.891
2002	-1.664
2003	-0.9907