69% (1978)

60% (1984)

57% (1981)

56% (1962)

57% (1979)

67% (1980)

56% (1972)

0% (1976)

51% (1985)

60% (1971)

58% (1979)

67% (1984)

61% (1971)

70% (1974)

55% (1981)

50% (1977)

68% (1976)

70% (1971)

68% (1985)

73% (1984)