81% (2009)

60% (2002)

60% (2006)

45% (2010)

43% (2005)

70% (1999)

25% (1991)

45% (2004)

56% (2010)

46% (1990)

43% (2005)

60% (2006)

49% (2000)

42% (2007)

70% (1994)

55% (2002)

36% (2003)

50% (1990)

50% (1993)

0% (1990)