Year	Years
1960	4.004
1961	4.884
1962	4.427
1963	4.291
1964	4.026
1965	3.908
1966	3.833
1967	3.52
1968	3.93
1969	3.883
1970	4.062
1971	3.743
1972	4.39
1973	5.041
1974	5.407
1975	5.537
1976	6.233
1977	6.052
1978	5.398
1979	5.483
1980	5.309
1981	4.004
1982	3.137
1983	1.641
1984	1.386
1985	1.742
1986	1.601
1987	1.902
1988	1.602
1989	1.494
1990	0.2441
1991	0.7589
1992	0.6132
1993	1.28
1994	1.426
1995	0.5687
1996	0.05024
1997	-0.2593
1998	-0.163
1999	-0.4434
2000	0.5141
2001	0.4627
2002	0.4183
2003	0.6183