65% (2002)

73% (1999)

61% (1998)

61% (1998)

64% (1993)

74% (2000)

69% (2006)

69% (1992)

69% (2006)

67% (1989)

67% (1996)

73% (1987)

63% (1984)

63% (1997)

65% (1996)

63% (1987)

71% (2004)

70% (1987)

65% (2005)

54% (2003)