31% (1967)

55% (1989)

59% (1969)

56% (1989)

54% (1966)

62% (1956)

62% (1989)

56% (1957)

55% (1959)

57% (1960)

64% (1972)

62% (1963)

68% (1963)

70% (1956)

56% (1959)

63% (1950)

67% (1963)

67% (1960)

47% (1996)

59% (1956)