67% (1974)

71% (1965)

55% (1967)

56% (1975)

60% (1966)

63% (1964)

50% (1969)

44% (1967)

50% (1974)

58% (1977)

51% (1970)

64% (1977)

62% (1966)

64% (1976)

61% (1963)

53% (1971)

66% (1969)

62% (1964)

42% (1958)

47% (1968)