72% (1973)

60% (1989)

37% (1983)

66% (1973)

58% (1968)

68% (1972)

73% (1984)

72% (1967)

60% (1990)

59% (1979)

70% (1979)

60% (1991)

68% (1986)

48% (1992)

69% (1985)

79% (1984)

67% (1990)

74% (1973)

59% (1959)

50% (1977)