Bi-annual	US dollars
1987-06-30	152
1987-12-31	460
1988-06-30	559
1988-12-31	723
1989-06-30	412
1989-12-31	435
1990-06-30	501
1990-12-31	480
1991-06-30	441
1991-12-31	968
1992-06-30	917
1992-12-31	1194
1993-06-30	4700
1993-12-31	4237
1994-06-30	2543
1994-12-31	2497
1995-06-30	2370
1995-12-31	4380
1996-06-30	4352
1996-12-31	6511
1997-06-30	5901
1997-12-31	5494
1998-06-30	10012
1998-12-31	8342
1999-06-30	7460