Bi-annual	US dollars
1987-06-30	8
1987-12-31	11
1988-06-30	22
1988-12-31	54
1989-06-30	53
1989-12-31	97
1990-06-30	31
1990-12-31	35
1991-06-30	21
1991-12-31	49
1992-06-30	63
1992-12-31	62
1993-06-30	134
1993-12-31	118
1994-06-30	222
1994-12-31	304
1995-06-30	426
1995-12-31	251
1996-06-30	590
1996-12-31	575
1997-06-30	830
1997-12-31	1167
1998-06-30	1055
1998-12-31	845
1999-06-30	512