56% (1974)

60% (1961)

60% (1968)

57% (1970)

61% (1974)

69% (1970)

69% (1991)

49% (1970)

54% (1973)

65% (1970)

63% (1970)

55% (1980)

66% (1968)

38% (1972)

50% (1975)

65% (1962)

20% (1992)

30% (1989)

36% (1976)

56% (1970)