63% (1977)

56% (1970)

50% (1975)

52% (1970)

67% (1975)

66% (1968)

43% (1969)

65% (1970)

67% (1970)

68% (1979)

35% (1979)

0% (1994)

58% (1935)

80% (1991)

20% (1955)

20% (1968)

67% (1995)

56% (1975)

40% (1974)

45% (1974)