50% (2008)

57% (2005)

30% (1989)

30% (1991)

44% (1994)

25% (2001)

62% (1985)

60% (2005)

27% (2009)

54% (1988)

43% (1984)

54% (2004)

40% (2010)

20% (1979)

48% (2009)

20% (2011)

30% (2004)

59% (1997)

45% (1996)

37% (1976)