Year	Years
1960	1.33
1961	1.268
1962	1.572
1963	1.134
1964	1.507
1965	1.646
1966	1.789
1967	1.899
1968	1.991
1969	1.97
1970	2.193
1971	2.187
1972	1.783
1973	1.999
1974	1.76
1975	1.805
1976	1.784
1977	1.738
1978	2.017
1979	1.499
1980	0.7645
1981	0.2161
1982	-0.4704
1983	-0.8494
1984	-0.8248
1985	-1.027
1986	-1.431
1987	-1.593
1988	-1.934
1989	-1.574
1990	-0.713
1991	-0.03119
1992	0.7102
1993	1.308
1994	1.52
1995	1.809
1996	2.03
1997	2.167
1998	2.247
1999	2.552
2000	2.442
2001	2.347
2002	1.976
2003	1.458