68% (1972)

67% (1983)

63% (1975)

67% (1973)

66% (1973)

61% (1980)

60% (1973)

50% (1977)

0% (1974)

53% (1977)

73% (1982)

54% (1974)

62% (1979)

59% (1971)

62% (1973)

60% (1976)

53% (1976)

61% (1973)

60% (1972)

50% (1977)