70% (1968)

60% (1967)

61% (1970)

59% (1986)

62% (1960)

63% (1978)

30% (1962)

64% (1983)

59% (1968)

77% (1983)

78% (1976)

59% (1970)

70% (1981)

68% (1976)

55% (1980)

71% (1975)

63% (1971)

69% (1970)

0% (1976)

53% (1964)