60% (2004)

70% (2006)

70% (2008)

76% (2007)

69% (2007)

70% (2007)

46% (2003)

50% (2006)

62% (2005)

54% (2005)

62% (2001)

60% (1978)

36% (2004)

37% (2003)

52% (2005)

57% (1980)

30% (2005)

35% (1969)