67% (1974)

60% (1966)

56% (1975)

55% (1967)

64% (1977)

55% (1961)

50% (1969)

53% (1971)

42% (1958)

62% (1964)

61% (1963)

71% (1965)

44% (1967)

66% (1969)

37% (1970)

0% (1965)

47% (1968)

63% (1964)

62% (1966)

52% (1962)