70% (1983)

69% (2006)

35% (2010)

64% (2012)

61% (1989)

60% (2009)

36% (2008)

20% (1988)

29% (2011)

40% (2007)

35% (2009)

80% (2007)

35% (2005)

20% (2008)

40% (2009)