Year	Years
1960	6.213
1961	6.428
1962	6.013
1963	6.481
1964	6.62
1965	5.325
1966	4.905
1967	4.44
1968	4.413
1969	4.47
1970	3.755
1971	2.151
1972	3.519
1973	3.095
1974	3.011
1975	3.349
1976	3.693
1977	3.571
1978	3.88
1979	3.35
1980	4.09
1981	4.982
1982	3.694
1983	2.233
1984	1.142
1985	0.3066
1986	-1.549
1987	-1.917
1988	-3.004
1989	-3.355
1990	-3.677
1991	-3.802
1992	-3.23
1993	-2.182
1994	-0.8363
1995	0.2981
1996	1.506
1997	1.612
1998	1.818
1999	3.278
2000	4.97
2001	4.568
2002	3.405
2003	6.814