50% (1972)

60% (1992)

72% (1971)

62% (1971)

50% (1985)

67% (1981)

39% (1977)

58% (1981)

53% (1987)

61% (1989)

64% (1972)

62% (1972)

57% (1990)

50% (1979)

58% (1971)

49% (1988)

61% (1972)

52% (1983)

44% (1987)

49% (1990)