67% (1982)

56% (1976)

51% (1981)

68% (1974)

64% (1977)

60% (1978)

62% (1976)

0% (1978)

68% (1976)

65% (1976)

61% (1982)

68% (1975)

61% (1979)

62% (1977)

54% (1979)

57% (1979)

45% (1981)

52% (1983)

40% (1983)

60% (1974)