Year	Percent
1961	-5.26092
1962	4.83788
1963	0.62924
1964	-8.13421
1965	-8.00696
1966	6.48213
1967	3.16291
1968	-0.59609
1969	-3.84239
1970	2.85321
1971	1.86689
1972	9.952
1973	-2.81785
1974	-21.00388
1975	21.59896
1976	-10.45819
1977	9.56785
1978	-7.57583
1979	-11.46552
1980	-10.02944
1981	1.73133
1982	2.34341
1983	-9.07548
1984	3.4366
1985	7.45521
1986	1.91733
1987	3.1391
1988	-2.59606
1989	-1.99669
1990	-2.8016