78% (1971)

67% (1988)

74% (1970)

61% (1969)

59% (1960)

62% (1968)

20% (1973)

90% (1961)

0% (1969)

0% (1967)

50% (1973)

50% (1968)

57% (1969)

74% (1950)

55% (1970)

60% (1965)

62% (1958)

47% (1964)

52% (1962)

33% (1965)