56% (1976)

77% (1969)

65% (1968)

64% (1973)

62% (1974)

64% (1975)

66% (1977)

48% (1976)

64% (1973)

56% (1974)

61% (1968)

63% (1934)

0% (1973)

60% (1972)

70% (1969)

0% (1934)