Bi-annual	US dollars
1987-06-30	2
1987-12-31	23
1988-06-30	12
1988-12-31	7
1989-06-30	3
1989-12-31	2
1990-06-30	2
1990-12-31	4
1991-06-30	3
1991-12-31	2
1992-06-30	8
1992-12-31	0
1993-06-30	44
1993-12-31	58
1994-06-30	69
1994-12-31	84
1995-06-30	130
1995-12-31	144
1996-06-30	197
1996-12-31	235
1997-06-30	233
1997-12-31	293
1998-06-30	297
1998-12-31	319
1999-06-30	304