57% (1991)

54% (1992)

45% (1988)

10% (1990)

50% (1993)

62% (1994)

35% (1993)

46% (1989)

45% (1996)

40% (1992)

58% (1990)

48% (1999)

0% (1991)

37% (1997)

0% (1999)

60% (1990)

51% (1998)

36% (1992)

60% (1989)

0% (1992)