64% (2008)

68% (1999)

63% (2003)

47% (1978)

68% (2006)

52% (2012)

50% (1982)

62% (1976)

0% (1976)

15% (1994)

66% (2005)

54% (1960)

66% (1969)

43% (1989)

55% (1983)

67% (1981)

62% (1969)

42% (1982)

67% (1974)

67% (2005)