70% (2008)

70% (2006)

59% (2004)

76% (2007)

50% (2006)

54% (2004)

69% (2007)

62% (2001)

70% (2007)

57% (2002)

62% (2005)

37% (2003)

60% (1978)

47% (2003)

35% (2004)

59% (1980)

35% (1969)

52% (2005)

30% (2005)