63% (1979)

67% (1979)

62% (1978)

49% (1976)

49% (1977)

43% (1976)

66% (1964)

66% (1973)

63% (1972)

50% (1976)

55% (1977)

51% (1976)

67% (1963)

63% (1974)

71% (1964)

60% (1976)

59% (1973)

66% (1964)

36% (1961)

52% (1969)