Bi-annual	US dollars
1987-06-30	321
1987-12-31	317
1988-06-30	324
1988-12-31	347
1989-06-30	281
1989-12-31	231
1990-06-30	241
1990-12-31	220
1991-06-30	126
1991-12-31	198
1992-06-30	240
1992-12-31	217
1993-06-30	266
1993-12-31	200
1994-06-30	264
1994-12-31	472
1995-06-30	476
1995-12-31	490
1996-06-30	370
1996-12-31	402
1997-06-30	426
1997-12-31	582
1998-06-30	645
1998-12-31	504
1999-06-30	918