Bi-annual	US dollars
1987-06-30	653
1987-12-31	736
1988-06-30	761
1988-12-31	891
1989-06-30	953
1989-12-31	1385
1990-06-30	1207
1990-12-31	1437
1991-06-30	1167
1991-12-31	1268
1992-06-30	1292
1992-12-31	1351
1993-06-30	1361
1993-12-31	1562
1994-06-30	1500
1994-12-31	1435
1995-06-30	1343
1995-12-31	969
1996-06-30	1153
1996-12-31	897
1997-06-30	872
1997-12-31	1111
1998-06-30	1199
1998-12-31	1679
1999-06-30	1206