67% (1979)

63% (1979)

59% (1973)

59% (1976)

63% (1978)

67% (1973)

51% (1969)

63% (1974)

56% (1977)

67% (1973)

66% (1964)

51% (1963)

67% (1963)

46% (1977)

68% (1977)

60% (1979)

59% (1972)

64% (1963)

51% (1976)

66% (1963)