Year	annual %
1961	-5.719771821086852
1962	4.403213415466681
1963	0.27894016514864006
1964	-8.6312875888798
1965	-8.31571860219988
1966	6.053204191848778
1967	3.3954277099688994
1968	-0.7141039245348964
1969	-4.204222106352049
1970	2.2560686581366554
1971	-0.21043331051666314
1972	7.522252908230584
1973	-4.2885065807470255
1974	-20.238925424917966
1975	26.47847904672787
1976	-3.3250816868408464
1977	19.691225747683163
1978	-3.380084542762873
1979	-13.622404302938037
1980	-12.187685483546218
1981	4.400743530512472
1982	2.7859387502900717
1983	-10.921039638340005
1984	-4.821245407719175
1985	2.2177776675044356
1986	-0.6119878569990362
1987	2.913914329809316
1988	-1.0982799119741031
1989	0.5620534794028771