Year	Years
1960	-0.4482
1961	-0.1085
1962	0.04231
1963	0.2937
1964	1.281
1965	2.078
1966	2.112
1967	2.618
1968	3.02
1969	2.912
1970	4.4
1971	4.339
1972	4.616
1973	3.886
1974	3.231
1975	3.048
1976	2.721
1977	2.989
1978	2.648
1979	3.232
1980	2.567
1981	2.777
1982	2.797
1983	3.126
1984	3.625
1985	3.528
1986	3.869
1987	3.878
1988	4.249
1989	3.697
1990	3.283
1991	3.273
1992	2.953
1993	2.702
1994	2.535
1995	2.521
1996	1.91
1997	1.493
1998	1.262
1999	1.402
2000	1.207
2001	0.833
2002	0.9598
2003	1.221
2004	1.291