67% (1983)

62% (1975)

69% (1972)

66% (1973)

66% (1973)

59% (1971)

73% (1982)

59% (1973)

50% (1977)

60% (1972)

61% (1980)

57% (1980)

60% (1976)

42% (1978)

62% (1979)

61% (1973)

68% (1972)

47% (1975)

0% (1972)

50% (1977)