57% (1991)

45% (1996)

62% (1994)

45% (1989)

52% (1992)

10% (1990)

45% (1988)

40% (1992)

0% (1990)

50% (1993)

35% (1993)

52% (1996)

60% (1989)

51% (1998)

40% (1992)

51% (1996)

37% (1997)

0% (1999)

57% (1991)

30% (1991)