76% (2001)

71% (2004)

67% (2007)

60% (2003)

70% (1989)

55% (2006)

59% (2000)

65% (2004)

65% (1994)

68% (1994)

60% (2002)

59% (2008)

54% (1998)

62% (1991)

45% (2006)

49% (1994)

62% (1997)

63% (1993)

58% (1999)

53% (1995)