53% (2007)

54% (2004)

54% (2008)

20% (1979)

71% (2007)

35% (2009)

43% (1984)

30% (1991)

20% (1980)

60% (2007)

62% (1985)

56% (1978)

20% (2000)

35% (2004)

61% (2005)

52% (2011)

30% (2010)

25% (2001)

20% (1979)

20% (2011)