61% (1989)

56% (1992)

55% (1986)

53% (1997)

56% (1998)

64% (1988)

47% (1984)

40% (1996)

69% (1993)

50% (1994)

70% (1995)

90% (1994)

87% (1991)

43% (1994)

73% (1985)

57% (1990)

68% (1986)

60% (1988)

50% (1990)

100% (1993)