Bi-annual	US dollars
1987-06-30	600
1987-12-31	679
1988-06-30	870
1988-12-31	971
1989-06-30	1141
1989-12-31	1245
1990-06-30	1182
1990-12-31	839
1991-06-30	592
1991-12-31	534
1992-06-30	567
1992-12-31	586
1993-06-30	596
1993-12-31	464
1994-06-30	335
1994-12-31	149
1995-06-30	62
1995-12-31	84
1996-06-30	79
1996-12-31	-1008
1997-06-30	180
1997-12-31	135
1998-06-30	484
1998-12-31	493
1999-06-30	629