Bi-annual	US dollars
1987-06-30	87
1987-12-31	175
1988-06-30	263
1988-12-31	78
1989-06-30	60
1989-12-31	398
1990-06-30	276
1990-12-31	214
1991-06-30	287
1991-12-31	355
1992-06-30	295
1992-12-31	317
1993-06-30	432
1993-12-31	75
1994-06-30	137
1994-12-31	20
1995-06-30	237
1995-12-31	366
1996-06-30	270
1996-12-31	106
1997-06-30	47
1997-12-31	117
1998-06-30	43
1998-12-31	305
1999-06-30	1178