Bi-annual	US dollars
1987-06-30	805
1987-12-31	836
1988-06-30	692
1988-12-31	457
1989-06-30	422
1989-12-31	543
1990-06-30	295
1990-12-31	413
1991-06-30	402
1991-12-31	680
1992-06-30	447
1992-12-31	542
1993-06-30	489
1993-12-31	356
1994-06-30	366
1994-12-31	421
1995-06-30	480
1995-12-31	662
1996-06-30	620
1996-12-31	709
1997-06-30	990
1997-12-31	1402
1998-06-30	1302
1998-12-31	2266
1999-06-30	2827