Bi-annual	US dollars
1987-06-30	537
1987-12-31	538
1988-06-30	534
1988-12-31	479
1989-06-30	629
1989-12-31	353
1990-06-30	356
1990-12-31	459
1991-06-30	246
1991-12-31	517
1992-06-30	542
1992-12-31	512
1993-06-30	1364
1993-12-31	1394
1994-06-30	1194
1994-12-31	3239
1995-06-30	3107
1995-12-31	2675
1996-06-30	1164
1996-12-31	1068
1997-06-30	2289
1997-12-31	6303
1998-06-30	2543
1998-12-31	3619
1999-06-30	1548