45% (1975)

43% (1984)

38% (1985)

61% (1980)

0% (1966)

64% (1986)

50% (1991)

60% (1970)

62% (1985)

51% (1985)

62% (1961)

0% (1959)

56% (1962)

49% (1980)

68% (1961)

52% (1964)

45% (1975)

48% (1983)

48% (1991)

35% (1982)