68% (2009)

69% (2007)

52% (2004)

67% (2009)

65% (1982)

64% (1995)

60% (1999)

67% (1986)

67% (1998)

73% (1983)

70% (1996)

50% (1991)

68% (1995)

71% (1994)

73% (2006)

62% (1990)

46% (1991)

33% (1993)

60% (1991)

70% (1994)