Year	annual %
1961	57.476635514018696
1962	10.979228486646884
1963	18.823529411764707
1964	0.8550855085508551
1965	-2.0526550647032575
1966	5.831435079726652
1967	15.312096427034009
1968	12.681524620151565
1969	8.441558441558442
1970	42.21556886227545
1971	-15.967776584317939
1972	32.369557992688605
1973	17.464609204503756
1974	28.73466837657427
1975	28.37584132619829
1976	19.38080125749873
1977	28.717145285754764
1978	32.51628274352898
1979	37.429280542500074
1980	20.198156370759314
1981	30.763156260259265
1982	15.71579790193657
1983	7.5243596133735995
1984	26.04980912561353
1985	81.10758580905683
1986	34.05000796305144
1987	127.12367827016753
1988	57.22655228330805
1989	162.8106597464817