Bi-annual	US dollars
1987-06-30	650
1987-12-31	798
1988-06-30	611
1988-12-31	1041
1989-06-30	636
1989-12-31	393
1990-06-30	317
1990-12-31	380
1991-06-30	292
1991-12-31	420
1992-06-30	255
1992-12-31	226
1993-06-30	243
1993-12-31	263
1994-06-30	241
1994-12-31	127
1995-06-30	175
1995-12-31	167
1996-06-30	323
1996-12-31	532
1997-06-30	622
1997-12-31	666
1998-06-30	712
1998-12-31	646
1999-06-30	378