Bi-annual	US dollars
1987-06-30	553
1987-12-31	634
1988-06-30	546
1988-12-31	517
1989-06-30	488
1989-12-31	440
1990-06-30	310
1990-12-31	336
1991-06-30	282
1991-12-31	303
1992-06-30	265
1992-12-31	227
1993-06-30	182
1993-12-31	167
1994-06-30	177
1994-12-31	181
1995-06-30	180
1995-12-31	175
1996-06-30	174
1996-12-31	91
1997-06-30	73
1997-12-31	56
1998-06-30	142
1998-12-31	156
1999-06-30	84