81% (2009)

67% (1999)

43% (2005)

52% (2002)

45% (2010)

60% (2006)

56% (2010)

43% (2004)

60% (2006)

45% (2000)

74% (1994)

43% (2005)

80% (2002)

56% (2000)

50% (1993)

46% (1990)

42% (2007)

0% (1990)

36% (2003)

37% (1991)