Year	%
1975	-7.188334039324349
1976	-8.757239796472286
1977	-3.0534337407982495
1978	-4.727461773694627
1979	-7.068829053139465
1980	-43.30169419325337
1981	-8.09755494536832
1982	-13.18431103519837
1983	-17.931377228965136
1984	-34.735130109746976
1985	-7.044412127568306
1986	-13.28709671742879
1987	-5.941218274626582
1988	-18.46228434798641