73% (2000)

75% (2009)

54% (2010)

66% (2008)

50% (2003)

64% (2008)

67% (1996)

48% (2008)

56% (1991)

57% (2001)

56% (1999)

70% (2008)

58% (1998)

47% (2001)

62% (1996)

56% (1991)

60% (1991)

60% (2001)

70% (2006)

56% (1995)