46% (1987)

61% (1986)

50% (1971)

71% (1988)

64% (1987)

69% (1989)

57% (1986)

63% (1985)

60% (1986)

69% (1987)

57% (1989)

70% (1985)

58% (1987)

65% (1970)

58% (1985)

57% (1987)

63% (1990)

55% (1985)

55% (1990)

60% (1981)