Bi-annual	US dollars
1987-06-30	37
1987-12-31	42
1988-06-30	48
1988-12-31	67
1989-06-30	59
1989-12-31	84
1990-06-30	66
1990-12-31	68
1991-06-30	60
1991-12-31	78
1992-06-30	82
1992-12-31	55
1993-06-30	215
1993-12-31	322
1994-06-30	238
1994-12-31	285
1995-06-30	302
1995-12-31	290
1996-06-30	402
1996-12-31	277
1997-06-30	324
1997-12-31	556
1998-06-30	422
1998-12-31	418
1999-06-30	393