57% (1975)

57% (1974)

44% (1973)

55% (1973)

50% (1973)

66% (1977)

51% (1975)

61% (1975)

47% (1975)

49% (1974)

70% (1974)

38% (1977)

50% (1971)

55% (1973)

40% (1982)

46% (1978)

66% (1973)

45% (1974)

50% (1982)

60% (1975)