27% (1991)

48% (1992)

45% (1996)

60% (2002)

36% (2002)

37% (1997)

62% (1999)

53% (2000)

38% (1993)

41% (2001)

45% (1993)

31% (1992)

51% (1998)

24% (2002)

53% (2000)

0% (1998)

30% (1997)

15% (1991)

52% (1996)