Bi-annual	US dollars
1987-06-30	1184
1987-12-31	1274
1988-06-30	1074
1988-12-31	1065
1989-06-30	983
1989-12-31	721
1990-06-30	732
1990-12-31	349
1991-06-30	315
1991-12-31	411
1992-06-30	1654
1992-12-31	915
1993-06-30	90
1993-12-31	405
1994-06-30	139
1994-12-31	582
1995-06-30	824
1995-12-31	251
1996-06-30	267
1996-12-31	62
1997-06-30	190
1997-12-31	5300
1998-06-30	4612
1998-12-31	3506
1999-06-30	3373