71% (2000)

62% (2002)

65% (2007)

74% (1999)

63% (2000)

57% (1992)

74% (2011)

75% (1999)

60% (2000)

58% (2005)

62% (1990)

65% (1996)

57% (1991)

56% (2002)

54% (1988)

73% (1987)

73% (2010)

61% (1988)

67% (1998)

52% (1991)