79% (1977)

70% (1985)

48% (1973)

65% (1974)

54% (1965)

70% (1988)

50% (1958)

74% (1986)

30% (1965)

39% (1986)

0% (1989)

60% (1949)

60% (1961)

67% (1989)

75% (1977)

71% (1961)

75% (1985)

56% (1967)

50% (1956)

62% (1980)