45% (1983)

51% (1977)

59% (1980)

46% (1977)

75% (1981)

60% (1979)

48% (1978)

70% (1978)

74% (1983)

60% (1978)

50% (1976)

29% (1979)

66% (1981)

40% (1980)

0% (1980)

65% (1979)

55% (1981)

90% (1975)

0% (1974)

58% (1982)