0% (1980)

64% (1979)

56% (1971)

71% (1981)

74% (1975)

80% (1977)

55% (1989)

74% (1981)

90% (1979)

40% (1990)

64% (1978)

59% (1970)

70% (1966)

63% (1981)

35% (1968)

0% (1961)

76% (1974)

58% (1967)

63% (1970)

60% (1958)