73% (1966)

56% (1967)

65% (1996)

61% (1990)

73% (1953)

60% (1964)

48% (1980)

63% (1997)

55% (1966)

57% (1985)

56% (1996)

66% (1951)

64% (1953)

66% (1989)

65% (1966)

61% (1986)

71% (1955)

61% (1968)

57% (1962)

49% (1993)