Year	Years
1960	1.94
1961	1.039
1962	1.005
1963	0.7956
1964	1.285
1965	1.547
1966	1.383
1967	1.721
1968	2.199
1969	2.055
1970	1.838
1971	1.892
1972	1.968
1973	1.934
1974	1.578
1975	0.9576
1976	0.9599
1977	0.8445
1978	0.3321
1979	0.272
1980	0.5426
1981	0.5168
1982	0.1396
1983	0.3616
1984	-0.7023
1985	-0.5897
1986	-0.6748
1987	-2.933
1988	-0.3643
1989	-1.387
1990	-0.8547
1991	-1.627
1992	0.9109
1993	1.314
1994	2.485
1995	2.794
1996	3.366
1997	6.272
1998	3.746
1999	5.357
2000	4.574
2001	5.163
2002	2.937
2003	1.483