73% (1985)

55% (1986)

61% (1989)

60% (1987)

57% (1992)

60% (1988)

75% (1993)

53% (1997)

45% (1990)

50% (1990)

50% (1994)

56% (1998)

47% (1984)

100% (1993)

90% (1994)

58% (1986)

60% (1988)

35% (1988)

38% (1996)

43% (1994)