51% (1997)

43% (2000)

55% (1995)

47% (1995)

45% (1993)

39% (1995)

28% (1994)

50% (1996)

40% (1996)

36% (1995)

38% (1994)

35% (1996)

49% (1995)

10% (1995)

23% (1996)

40% (1996)

60% (1999)

50% (1994)

32% (1992)

46% (1995)