70% (1979)

70% (1971)

61% (1982)

67% (1966)

56% (1964)

52% (1958)

65% (1965)

51% (1969)

62% (1968)

51% (1972)

63% (1968)

56% (1961)

43% (1958)

68% (1966)

56% (1989)

63% (1969)

35% (1977)

52% (1970)

52% (1968)

50% (1982)