71% (2004)

64% (1997)

64% (1998)

69% (1989)

59% (2001)

55% (1999)

70% (1978)

72% (1998)

69% (1985)

73% (1999)

58% (1998)

60% (1997)

69% (2000)

64% (1998)

40% (2002)

65% (1986)

57% (1987)

0% (1988)

74% (1980)