36% (1980)

51% (1985)

62% (1977)

54% (1980)

50% (1985)

59% (1985)

39% (1987)

29% (1985)

61% (1985)

39% (1981)

54% (1989)

45% (1979)

63% (1987)

72% (1987)

59% (1986)

50% (1988)

41% (1983)

51% (1985)

30% (1987)

50% (1987)