76% (1989)

71% (1992)

74% (1993)

64% (1993)

73% (1987)

74% (1986)

64% (1989)

63% (2005)

52% (1997)

46% (2003)

64% (1992)

65% (2010)

65% (1992)

67% (1990)

54% (1994)

64% (2000)

54% (1998)

56% (1993)

63% (2011)

46% (2002)