Bi-annual	US dollars
1987-06-30	31
1987-12-31	60
1988-06-30	46
1988-12-31	190
1989-06-30	67
1989-12-31	60
1990-06-30	77
1990-12-31	89
1991-06-30	86
1991-12-31	133
1992-06-30	177
1992-12-31	102
1993-06-30	509
1993-12-31	265
1994-06-30	299
1994-12-31	304
1995-06-30	485
1995-12-31	420
1996-06-30	406
1996-12-31	498
1997-06-30	541
1997-12-31	734
1998-06-30	965
1998-12-31	965
1999-06-30	1179