60% (1982)

64% (1977)

58% (1978)

54% (1981)

56% (1978)

63% (1978)

63% (1976)

53% (1979)

51% (1985)

50% (1980)

50% (1977)

59% (1977)

0% (1978)

63% (1977)

0% (1975)

54% (1975)

42% (1980)

60% (1976)

27% (1984)

60% (1983)