67% (1998)

63% (1998)

60% (2001)

65% (1998)

59% (1991)

58% (1991)

66% (1995)

48% (1997)

50% (1998)

60% (1987)

54% (2000)

45% (1996)

62% (1988)

50% (1990)

57% (1993)

54% (1997)

40% (1988)

63% (2001)

52% (2001)

66% (1988)