50% (1985)

58% (1981)

62% (1972)

61% (1971)

72% (1971)

57% (1990)

50% (1979)

50% (1972)

49% (1985)

39% (1977)

59% (1989)

41% (1990)

63% (1972)

62% (1972)

70% (1981)

51% (1983)

58% (1971)

50% (1988)

54% (1987)

58% (1987)