Year	Years
1961	0.3497
1962	0.6561
1963	1.312
1964	1.149
1965	0.5918
1966	0.6969
1967	1.057
1968	0.8161
1969	1.281
1970	1.709
1971	1.507
1972	1.777
1973	1.783
1974	1.971
1975	2.478
1976	2.938
1977	3.259
1978	3.896
1979	4.524
1980	4.977
1981	5.271
1982	4.865
1983	4.403
1984	3.967
1985	3.541
1986	2.904
1987	2.214
1988	1.844
1989	1.341
1990	0.5185
1991	0.00224
1992	0.1211
1993	0.6021
1994	0.5755
1995	0.6291
1996	0.882
1997	0.7933
1998	0.1763
1999	-0.2135
2000	-0.2888
2001	-0.2041
2002	-0.6747
2003	-0.9348