Bi-annual	US dollars
1987-06-30	505
1987-12-31	400
1988-06-30	657
1988-12-31	535
1989-06-30	625
1989-12-31	518
1990-06-30	570
1990-12-31	282
1991-06-30	328
1991-12-31	443
1992-06-30	285
1992-12-31	256
1993-06-30	494
1993-12-31	1095
1994-06-30	1292
1994-12-31	590
1995-06-30	653
1995-12-31	914
1996-06-30	904
1996-12-31	755
1997-06-30	970
1997-12-31	987
1998-06-30	967
1998-12-31	619
1999-06-30	1137