Bi-annual	US dollars
1987-06-30	1837
1987-12-31	1949
1988-06-30	1620
1988-12-31	1553
1989-06-30	1538
1989-12-31	1121
1990-06-30	950
1990-12-31	648
1991-06-30	569
1991-12-31	669
1992-06-30	1916
1992-12-31	2382
1993-06-30	672
1993-12-31	733
1994-06-30	369
1994-12-31	853
1995-06-30	875
1995-12-31	336
1996-06-30	387
1996-12-31	209
1997-06-30	343
1997-12-31	5722
1998-06-30	5826
1998-12-31	4940
1999-06-30	4410