61% (1979)

64% (1963)

60% (1966)

59% (1977)

28% (1959)

50% (1986)

69% (1958)

59% (1985)

77% (1985)

59% (1970)

72% (1989)

76% (1977)

71% (1968)

63% (1983)

0% (1987)

55% (1974)

66% (1984)

54% (1991)

69% (1990)

69% (1987)