Bi-annual	US dollars
1987-06-30	206
1987-12-31	328
1988-06-30	433
1988-12-31	322
1989-06-30	163
1989-12-31	245
1990-06-30	410
1990-12-31	401
1991-06-30	409
1991-12-31	816
1992-06-30	295
1992-12-31	474
1993-06-30	560
1993-12-31	299
1994-06-30	235
1994-12-31	244
1995-06-30	275
1995-12-31	203
1996-06-30	199
1996-12-31	142
1997-06-30	131
1997-12-31	120
1998-06-30	233
1998-12-31	155
1999-06-30	334