50% (2001)

49% (1998)

38% (1997)

53% (1998)

72% (1996)

30% (1996)

33% (1998)

42% (1995)

67% (1999)

60% (1995)

45% (1996)

50% (1997)

46% (1995)

75% (1994)

27% (1996)

49% (1994)

20% (1994)

50% (1996)

60% (1998)

40% (1993)