Year	Years
1960	1.035
1961	0.9879
1962	1.694
1963	1.114
1964	1.456
1965	1.683
1966	1.543
1967	1.413
1968	1.255
1969	2.751
1970	2.168
1971	2.116
1972	2.242
1973	3.041
1974	2.806
1975	1.72
1976	1.664
1977	1.901
1978	1.147
1979	1.056
1980	1.045
1981	0.1323
1982	-0.4645
1983	-0.4582
1984	-0.7445
1985	-1.429
1986	-0.5831
1987	-0.8717
1988	-0.8911
1989	-2.33
1990	-2.686
1991	-1.019
1992	0.5752
1993	0.8056
1994	1.103
1995	1.653
1996	1.359
1997	1.89
1998	2.603
1999	3.189
2000	3.249
2001	1.625
2002	-0.501
2003	-0.3498
2004	-0.02087