55% (1976)

64% (1973)

76% (1969)

62% (1974)

65% (1973)

65% (1975)

45% (1976)

65% (1968)

66% (1977)

64% (1934)

0% (1973)

56% (1974)

61% (1968)

60% (1972)

57% (1969)

0% (1934)

40% (1976)