60% (1970)

57% (1973)

49% (1984)

64% (1980)

69% (1967)

61% (1968)

90% (1982)

57% (1988)

65% (1984)

59% (1970)

68% (1978)

70% (1973)

40% (1978)

60% (1980)

63% (1972)

72% (1973)

60% (1975)

51% (1978)

50% (1972)

60% (1982)