55% (1999)

49% (2004)

62% (2001)

69% (1996)

71% (2007)

64% (1985)

71% (1994)

58% (2007)

59% (2002)

65% (1987)

64% (1992)

73% (1987)

60% (2002)

61% (1987)

51% (2001)

48% (2010)

57% (1991)

65% (1986)

65% (2008)

72% (1992)