65% (2008)

70% (2006)

58% (2004)

55% (2003)

71% (2001)

63% (2001)

57% (2006)

59% (1999)

62% (2000)

73% (2000)

72% (2005)

56% (2000)

67% (1995)

52% (2008)

57% (2008)

83% (1989)

55% (1999)

40% (1996)

77% (2008)

60% (1970)