71% (2004)

59% (2001)

64% (1997)

40% (2002)

72% (1999)

60% (1997)

54% (1999)

71% (1978)

68% (1985)

69% (1989)

69% (2000)

59% (1998)

63% (1998)

65% (1986)

57% (1987)

0% (1973)

0% (1988)

74% (1980)