78% (2004)

67% (2008)

53% (2008)

70% (2008)

70% (2006)

59% (2004)

76% (2007)

54% (2004)

62% (2001)

50% (2006)

70% (2007)

62% (2005)

47% (2003)

57% (2002)

69% (2007)

53% (2005)

60% (1978)

59% (1980)

37% (2003)

35% (1969)