Bi-annual	US dollars
1987-06-30	737
1987-12-31	1013
1988-06-30	1236
1988-12-31	902
1989-06-30	1242
1989-12-31	1361
1990-06-30	1810
1990-12-31	1939
1991-06-30	1505
1991-12-31	1653
1992-06-30	1471
1992-12-31	392
1993-06-30	320
1993-12-31	381
1994-06-30	636
1994-12-31	1203
1995-06-30	816
1995-12-31	909
1996-06-30	991
1996-12-31	1221
1997-06-30	1486
1997-12-31	1435
1998-06-30	1292
1998-12-31	1388
1999-06-30	1209