60% (1991)

50% (1994)

60% (1992)

36% (1992)

35% (1994)

70% (1990)

41% (1989)

48% (1993)

40% (1996)

48% (1989)

32% (1991)

56% (1996)

35% (1991)

0% (1993)

72% (1994)

60% (1989)

85% (1995)

43% (1994)

30% (1991)

53% (1996)