61% (1970)

64% (1990)

59% (1977)

72% (1972)

50% (1986)

40% (1995)

60% (1967)

60% (1966)

66% (1975)

69% (1966)

60% (1957)

80% (1983)

64% (1964)

68% (1970)

67% (1984)

0% (1989)

61% (1972)

48% (1988)

69% (1990)

56% (1971)