Bi-annual	US dollars
1987-06-30	334
1987-12-31	415
1988-06-30	336
1988-12-31	367
1989-06-30	445
1989-12-31	297
1990-06-30	586
1990-12-31	320
1991-06-30	430
1991-12-31	598
1992-06-30	346
1992-12-31	308
1993-06-30	533
1993-12-31	609
1994-06-30	864
1994-12-31	760
1995-06-30	843
1995-12-31	969
1996-06-30	959
1996-12-31	1318
1997-06-30	1524
1997-12-31	2290
1998-06-30	2948
1998-12-31	6285
1999-06-30	4663