Bi-annual	US dollars
1987-06-30	45
1987-12-31	91
1988-06-30	68
1988-12-31	166
1989-06-30	293
1989-12-31	211
1990-06-30	157
1990-12-31	154
1991-06-30	78
1991-12-31	58
1992-06-30	53
1992-12-31	38
1993-06-30	272
1993-12-31	350
1994-06-30	330
1994-12-31	494
1995-06-30	361
1995-12-31	361
1996-06-30	378
1996-12-31	500
1997-06-30	719
1997-12-31	699
1998-06-30	293
1998-12-31	220
1999-06-30	265