65% (1968)

38% (1988)

70% (1959)

61% (1964)

58% (1961)

56% (1970)

30% (1985)

60% (1973)

0% (1980)

60% (1956)

57% (1957)

52% (1984)

52% (1970)

40% (1989)

50% (1988)

60% (1961)

50% (1989)

10% (1974)

0% (1972)

0% (1976)