65% (1979)

51% (1976)

66% (1979)

52% (1976)

72% (1975)

66% (1977)

68% (1975)

31% (1976)

40% (1978)

47% (1976)

46% (1974)

57% (1976)

48% (1983)

58% (1978)

51% (1983)

50% (1978)

60% (1975)

56% (1977)

52% (1982)

70% (1981)