Bi-annual	US dollars
1987-06-30	189
1987-12-31	232
1988-06-30	148
1988-12-31	136
1989-06-30	158
1989-12-31	155
1990-06-30	159
1990-12-31	156
1991-06-30	227
1991-12-31	159
1992-06-30	211
1992-12-31	189
1993-06-30	249
1993-12-31	544
1994-06-30	304
1994-12-31	191
1995-06-30	218
1995-12-31	281
1996-06-30	356
1996-12-31	378
1997-06-30	591
1997-12-31	579
1998-06-30	689
1998-12-31	1539
1999-06-30	970