59% (2006)

55% (1998)

71% (1974)

54% (1962)

65% (1959)

70% (1977)

50% (1978)

46% (1980)

60% (1975)

49% (1977)

60% (1980)

62% (1953)

63% (1976)

57% (1979)

66% (1956)

45% (1983)