72% (1972)

72% (2003)

72% (2009)

69% (1983)

53% (2005)

38% (1987)

55% (2006)

73% (2000)

55% (1999)

59% (1986)

81% (1954)

80% (1952)

54% (2005)

50% (1989)

57% (1990)

56% (1996)

63% (1971)

73% (2002)

35% (1971)

70% (2003)