73% (2000)

54% (2010)

65% (2008)

50% (2003)

75% (2009)

64% (2008)

56% (1999)

66% (1996)

57% (2001)

57% (1991)

57% (1995)

48% (2008)

70% (2008)

28% (1996)

20% (1996)

48% (1997)

80% (2009)

62% (1996)

53% (2001)

43% (1989)