76% (2001)

56% (2006)

70% (2004)

60% (2002)

60% (2003)

65% (1994)

70% (1989)

64% (1993)

65% (2004)

59% (2000)

67% (2007)

59% (2008)

54% (1998)

62% (1991)

68% (1994)

45% (2006)

58% (1999)

62% (1997)

49% (1994)

58% (1992)