73% (1988)

69% (1984)

67% (1966)

70% (1986)

65% (1982)

50% (1955)

71% (1972)

0% (1989)

57% (1978)

52% (1971)

62% (1950)

44% (1982)

53% (1977)

25% (1991)

50% (1981)

75% (1967)

50% (1989)

70% (1986)

70% (1977)

74% (1958)