61% (1990)

62% (2001)

53% (2002)

62% (1969)

75% (1970)

64% (1990)

73% (1960)

66% (2000)

73% (1953)

60% (1996)

64% (1962)

64% (2002)

69% (1959)

76% (2001)

67% (1953)

67% (1983)

59% (1995)

64% (1992)

55% (1994)

72% (1971)