81% (2009)

42% (2007)

43% (2005)

46% (1990)

45% (2004)

55% (2002)

68% (1999)

56% (2010)

45% (2010)

80% (2002)

49% (2000)

70% (1994)

60% (2006)

36% (2003)

43% (2005)

25% (1991)

50% (1993)

60% (2002)

50% (1990)

60% (2006)