64% (1981)

62% (1979)

64% (1980)

60% (1979)

67% (1980)

55% (1985)

55% (1978)

59% (1981)

42% (1978)

57% (1979)

51% (1978)

56% (1984)

56% (1980)

64% (1980)

65% (1980)

55% (1981)

62% (1979)

68% (1979)

0% (1978)

20% (1978)