48% (1997)

71% (2003)

62% (1986)

42% (1996)

71% (2001)

56% (1994)

63% (2000)

52% (1980)

55% (1980)

48% (1993)

77% (1987)

57% (1994)

79% (1992)

68% (1988)

58% (2003)

73% (1993)

0% (1987)

68% (1990)

65% (1992)

75% (1995)