76% (2001)

70% (2004)

70% (1989)

65% (2004)

56% (2006)

60% (2002)

65% (1994)

62% (1991)

59% (2000)

60% (2003)

66% (2007)

68% (1994)

58% (2008)

54% (1998)

62% (1997)

46% (2006)

64% (1993)

57% (1997)

54% (1995)

59% (1992)