69% (1992)

64% (1988)

51% (2001)

63% (1986)

59% (1983)

73% (1997)

74% (2002)

67% (2002)

64% (1986)

52% (2004)

57% (1992)

57% (1995)

67% (1990)

69% (1995)

57% (1990)

50% (1990)

65% (1991)