61% (1971)

0% (1975)

60% (1973)

68% (1983)

64% (1973)

63% (1972)

68% (1972)

60% (1972)

62% (1973)

66% (1973)

63% (1975)

67% (1973)

70% (1974)

55% (1972)

57% (1972)

50% (1977)

60% (1980)

50% (1977)

47% (1979)

57% (1980)