Year	Years
1960	4.032
1961	4.083
1962	3.263
1963	3.403
1964	2.678
1965	2.877
1966	2.004
1967	2.423
1968	2.054
1969	1.581
1970	1.766
1971	1.826
1972	1.948
1973	2.166
1974	2.118
1975	2.29
1976	2.789
1977	3.106
1978	3.095
1979	2.94
1980	3.099
1981	3.097
1982	2.485
1983	1.855
1984	1.548
1985	0.2121
1986	-0.0493
1987	-0.5291
1988	-0.2349
1989	0.03934
1990	-0.2596
1991	-0.5902
1992	-0.4478
1993	-0.5376
1994	0.2745
1995	1.124
1996	0.9847
1997	1.69
1998	0.7232
1999	0.8885
2000	1.774
2001	1.348
2002	1.335
2003	1.256
2004	1.815