Bi-annual	US dollars
1987-06-30	281
1987-12-31	296
1988-06-30	281
1988-12-31	302
1989-06-30	264
1989-12-31	248
1990-06-30	234
1990-12-31	239
1991-06-30	136
1991-12-31	149
1992-06-30	131
1992-12-31	156
1993-06-30	131
1993-12-31	111
1994-06-30	120
1994-12-31	158
1995-06-30	157
1995-12-31	155
1996-06-30	157
1996-12-31	190
1997-06-30	236
1997-12-31	188
1998-06-30	137
1998-12-31	130
1999-06-30	82