71% (1971)

69% (1979)

68% (1973)

62% (1968)

61% (1982)

63% (1968)

60% (1979)

61% (1969)

66% (1966)

50% (1964)

30% (1960)

0% (1967)

59% (1989)

51% (1969)

52% (1968)

43% (1965)

65% (1964)

54% (1964)

0% (1957)

0% (1961)