55% (1999)

49% (2004)

62% (2001)

70% (1996)

43% (1992)

58% (2007)

64% (1985)

71% (1994)

72% (1992)

63% (1992)

46% (2001)

70% (2007)

73% (1987)

56% (2010)

59% (2002)

61% (2007)

61% (1997)

60% (1987)

48% (2010)

64% (1995)