57% (1991)

40% (1992)

45% (1989)

45% (1996)

45% (1988)

37% (1997)

40% (1992)

52% (1992)

50% (1993)

35% (1993)

36% (1992)

51% (1996)

62% (1994)

10% (1990)

51% (1998)

0% (1990)

55% (1990)

30% (1991)

60% (1989)

60% (1990)