Bi-annual	US dollars
1987-06-30	739
1987-12-31	913
1988-06-30	1028
1988-12-31	1139
1989-06-30	1332
1989-12-31	1411
1990-06-30	1420
1990-12-31	1206
1991-06-30	370
1991-12-31	405
1992-06-30	207
1992-12-31	358
1993-06-30	383
1993-12-31	414
1994-06-30	542
1994-12-31	397
1995-06-30	423
1995-12-31	459
1996-06-30	533
1996-12-31	380
1997-06-30	591
1997-12-31	1190
1998-06-30	1339
1998-12-31	1047
1999-06-30	1154