Bi-annual	US dollars
1987-06-30	1029
1987-12-31	1028
1988-06-30	986
1988-12-31	1029
1989-06-30	788
1989-12-31	619
1990-06-30	439
1990-12-31	434
1991-06-30	365
1991-12-31	383
1992-06-30	335
1992-12-31	285
1993-06-30	215
1993-12-31	191
1994-06-30	179
1994-12-31	191
1995-06-30	194
1995-12-31	205
1996-06-30	227
1996-12-31	190
1997-06-30	128
1997-12-31	102
1998-06-30	230
1998-12-31	225
1999-06-30	166