30% (1989)

30% (1991)

50% (2008)

52% (2011)

68% (2007)

20% (1979)

25% (2001)

54% (2004)

62% (1985)

57% (2005)

30% (2004)

44% (1994)

27% (2009)

43% (1984)

20% (1992)

20% (1979)

40% (2010)

60% (2007)

0% (1987)

53% (2012)