71% (1979)

60% (1969)

62% (1964)

71% (1958)

72% (1961)

62% (1978)

53% (1964)

47% (1971)

51% (1983)

63% (1967)

55% (1975)

68% (1979)

70% (1980)

57% (1962)

70% (1961)

56% (1956)

62% (1959)

57% (1977)

58% (1958)

69% (1961)