Bi-annual	US dollars
1987-06-30	21
1987-12-31	23
1988-06-30	31
1988-12-31	36
1989-06-30	16
1989-12-31	18
1990-06-30	3
1990-12-31	12
1991-06-30	11
1991-12-31	37
1992-06-30	23
1992-12-31	17
1993-06-30	54
1993-12-31	49
1994-06-30	57
1994-12-31	136
1995-06-30	126
1995-12-31	226
1996-06-30	440
1996-12-31	757
1997-06-30	917
1997-12-31	1147
1998-06-30	837
1998-12-31	1468
1999-06-30	1053