63% (2011)

52% (1997)

76% (1989)

54% (1998)

66% (2002)

72% (1992)

65% (1992)

66% (2010)

74% (1986)

64% (1991)

65% (1993)

63% (1996)

61% (1993)

73% (1987)

63% (2005)

74% (1993)

67% (1990)

64% (1992)

57% (1993)

55% (1994)