73% (1973)

57% (1974)

49% (1974)

69% (1979)

54% (1968)

65% (1976)

45% (1970)

64% (1971)

62% (1980)

59% (1979)

32% (1972)

52% (1971)

54% (1970)

67% (1986)

52% (1975)

54% (1967)

46% (1980)

0% (1967)

59% (1977)

0% (1996)