49% (1973)

67% (1976)

86% (1980)

73% (1989)

76% (1977)

58% (1975)

72% (1990)

53% (1974)

10% (1989)

40% (1979)

68% (1989)

0% (1975)

58% (1991)

72% (1992)

0% (1988)

72% (1967)

35% (1972)

73% (1987)

62% (1975)

0% (1968)