61% (1997)

64% (1990)

56% (1996)

68% (1992)

62% (1990)

68% (1988)

62% (1991)

41% (1990)

47% (1995)

43% (1995)

43% (1990)

45% (1988)

55% (1993)

72% (1996)

52% (1989)

46% (1998)

55% (1994)

50% (1996)

25% (1991)

25% (1996)