57% (1975)

0% (1977)

71% (1984)

71% (1988)

61% (1971)

58% (1988)

10% (1966)

10% (1974)

0% (1979)

58% (1989)

68% (1984)

70% (1967)

62% (1975)

0% (1964)

53% (1974)

45% (1972)

69% (1986)

64% (1980)

69% (1968)

70% (1977)