Bi-annual	US dollars
1987-06-30	516
1987-12-31	192
1988-06-30	153
1988-12-31	119
1989-06-30	281
1989-12-31	324
1990-06-30	276
1990-12-31	255
1991-06-30	302
1991-12-31	202
1992-06-30	226
1992-12-31	205
1993-06-30	98
1993-12-31	145
1994-06-30	287
1994-12-31	163
1995-06-30	173
1995-12-31	149
1996-06-30	233
1996-12-31	116
1997-06-30	276
1997-12-31	393
1998-06-30	408
1998-12-31	316
1999-06-30	306