Bi-annual	US dollars
1987-06-30	1467
1987-12-31	1776
1988-06-30	1859
1988-12-31	1812
1989-06-30	1028
1989-12-31	658
1990-06-30	298
1990-12-31	197
1991-06-30	483
1991-12-31	273
1992-06-30	430
1992-12-31	371
1993-06-30	200
1993-12-31	353
1994-06-30	488
1994-12-31	433
1995-06-30	315
1995-12-31	541
1996-06-30	336
1996-12-31	599
1997-06-30	497
1997-12-31	502
1998-06-30	570
1998-12-31	732
1999-06-30	601