Bi-annual	US dollars
1987-06-30	568
1987-12-31	509
1988-06-30	585
1988-12-31	396
1989-06-30	425
1989-12-31	492
1990-06-30	499
1990-12-31	450
1991-06-30	185
1991-12-31	204
1992-06-30	244
1992-12-31	339
1993-06-30	413
1993-12-31	427
1994-06-30	458
1994-12-31	602
1995-06-30	469
1995-12-31	467
1996-06-30	362
1996-12-31	366
1997-06-30	368
1997-12-31	512
1998-06-30	550
1998-12-31	414
1999-06-30	476