Bi-annual	US dollars
1987-06-30	1213
1987-12-31	1130
1988-06-30	1388
1988-12-31	1327
1989-06-30	953
1989-12-31	740
1990-06-30	443
1990-12-31	299
1991-06-30	355
1991-12-31	342
1992-06-30	586
1992-12-31	211
1993-06-30	1598
1993-12-31	958
1994-06-30	833
1994-12-31	393
1995-06-30	466
1995-12-31	736
1996-06-30	991
1996-12-31	3421
1997-06-30	1016
1997-12-31	469
1998-06-30	388
1998-12-31	341
1999-06-30	419