Bi-annual	US dollars
1987-06-30	872
1987-12-31	640
1988-06-30	430
1988-12-31	866
1989-06-30	662
1989-12-31	364
1990-06-30	549
1990-12-31	226
1991-06-30	245
1991-12-31	303
1992-06-30	223
1992-12-31	242
1993-06-30	405
1993-12-31	841
1994-06-30	995
1994-12-31	806
1995-06-30	226
1995-12-31	352
1996-06-30	328
1996-12-31	911
1997-06-30	336
1997-12-31	553
1998-06-30	720
1998-12-31	168
1999-06-30	207