72% (1981)

65% (1984)

39% (1977)

65% (1979)

79% (1976)

47% (1984)

54% (1987)

51% (1976)

40% (1978)

49% (1995)

66% (1977)

58% (1976)

77% (1974)

66% (1976)

51% (1983)

50% (1979)

56% (1979)

38% (1978)

46% (1978)

47% (1976)