70% (1974)

71% (1971)

65% (1961)

70% (1971)

81% (1969)

60% (1969)

90% (1990)

63% (1988)

35% (1968)

70% (1983)

78% (1973)

78% (1980)

43% (1975)

60% (1984)

81% (1980)

83% (1975)

57% (1976)

69% (1984)

46% (1980)

82% (1985)