Year	annual %
1961	-3.258929953073391
1962	7.1381755269392215
1963	2.9110563760741854
1964	-6.233211221526176
1965	-5.896514279325558
1966	8.846762444422083
1967	6.112649801558362
1968	1.9000484964096955
1969	-1.6861123797236388
1970	4.955509455932813
1971	2.401972321218196
1972	10.333400235043428
1973	-1.7452349296302003
1974	-18.186825768262835
1975	29.61960842479425
1976	-0.9131753264063747
1977	22.88737091126356
1978	3.746654951458254
1979	-2.212368053222889
1980	-4.339486854251135
1981	5.157566991257042
1982	3.0780547637852607
1983	-8.066767636375644
1984	-1.3115004277030664
1985	6.4165254089213875
1986	3.554143220761688
1987	6.629483491240734
1988	-1.0643316875450353
1989	-1.1946215915686906