60% (1982)

63% (1977)

58% (1978)

59% (1977)

56% (1978)

54% (1981)

55% (1979)

66% (1983)

50% (1980)

53% (1979)

63% (1976)

51% (1985)

75% (1978)

63% (1978)

27% (1984)

60% (1976)

90% (1982)

66% (1979)

20% (1983)

100% (1975)