52% (1957)

50% (1964)

50% (1977)

59% (1964)

58% (1970)

70% (1967)

63% (1979)

60% (1970)

58% (1985)

57% (1953)

40% (1974)

50% (1950)

57% (1985)

60% (1964)

70% (1967)

63% (1966)

0% (1972)

50% (1951)

60% (1961)

51% (2003)