63% (2003)

64% (2008)

69% (1999)

66% (2005)

52% (2012)

67% (2005)

68% (2006)

49% (2006)

60% (1971)

15% (1994)

60% (1984)

55% (1983)

57% (1996)

44% (1972)

61% (1964)

54% (1960)

50% (2000)

67% (1974)

42% (1982)

66% (1969)