Bi-annual	US dollars
1987-06-30	15
1987-12-31	49
1988-06-30	15
1988-12-31	81
1989-06-30	104
1989-12-31	106
1990-06-30	148
1990-12-31	193
1991-06-30	115
1991-12-31	75
1992-06-30	126
1992-12-31	100
1993-06-30	99
1993-12-31	44
1994-06-30	106
1994-12-31	233
1995-06-30	202
1995-12-31	197
1996-06-30	270
1996-12-31	402
1997-06-30	639
1997-12-31	1611
1998-06-30	2129
1998-12-31	3143
1999-06-30	3877