Bi-annual	US dollars
1987-06-30	258
1987-12-31	262
1988-06-30	329
1988-12-31	450
1989-06-30	319
1989-12-31	234
1990-06-30	248
1990-12-31	199
1991-06-30	195
1991-12-31	120
1992-06-30	74
1992-12-31	82
1993-06-30	372
1993-12-31	312
1994-06-30	363
1994-12-31	196
1995-06-30	410
1995-12-31	546
1996-06-30	691
1996-12-31	832
1997-06-30	662
1997-12-31	984
1998-06-30	824
1998-12-31	639
1999-06-30	520