57% (1991)

45% (1989)

45% (1996)

40% (1992)

52% (1992)

62% (1994)

35% (1993)

45% (1988)

51% (1996)

51% (1998)

37% (1997)

57% (1991)

40% (1992)

0% (1990)

52% (1996)

10% (1990)

36% (1992)

50% (1993)

60% (1989)

60% (1990)