58% (1981)

71% (1980)

44% (1992)

43% (1978)

50% (1986)

66% (1991)

60% (1983)

59% (1987)

51% (1981)

66% (1993)

50% (1984)

74% (1989)

58% (1985)

55% (1979)

67% (1977)

57% (1981)

64% (1977)

50% (1974)

50% (1990)

64% (1984)