76% (1962)

56% (1985)

65% (1969)

55% (1974)

68% (1985)

58% (1965)

50% (1984)

68% (1981)

71% (1981)

56% (1977)

59% (1980)

62% (1986)

60% (1963)

55% (1983)

43% (1987)

20% (1991)

34% (1973)

85% (2007)

50% (1995)

60% (1992)