45% (1983)

29% (1979)

50% (1977)

50% (1976)

48% (1978)

60% (1979)

59% (1980)

0% (1979)

75% (1981)

40% (1980)

46% (1977)

90% (1975)

55% (1981)

65% (1979)

0% (1980)

58% (1982)

66% (1981)

60% (1978)

0% (1981)

74% (1983)