Bi-annual	US dollars
1987-06-30	71
1987-12-31	75
1988-06-30	77
1988-12-31	49
1989-06-30	64
1989-12-31	66
1990-06-30	70
1990-12-31	68
1991-06-30	41
1991-12-31	47
1992-06-30	53
1992-12-31	47
1993-06-30	173
1993-12-31	171
1994-06-30	247
1994-12-31	280
1995-06-30	301
1995-12-31	293
1996-06-30	311
1996-12-31	383
1997-06-30	451
1997-12-31	576
1998-06-30	812
1998-12-31	642
1999-06-30	588