46% (1974)

49% (1975)

48% (1983)

50% (1976)

42% (1977)

60% (1983)

56% (1975)

68% (1975)

45% (1977)

57% (1974)

55% (1978)

57% (1977)

50% (1978)

50% (1976)

40% (1978)

49% (1976)

57% (1977)

63% (1979)

0% (2001)

60% (1975)