Bi-annual	US dollars
1987-06-30	108
1987-12-31	177
1988-06-30	119
1988-12-31	56
1989-06-30	110
1989-12-31	32
1990-06-30	28
1990-12-31	46
1991-06-30	63
1991-12-31	62
1992-06-30	95
1992-12-31	183
1993-06-30	158
1993-12-31	273
1994-06-30	273
1994-12-31	1594
1995-06-30	1366
1995-12-31	740
1996-06-30	186
1996-12-31	231
1997-06-30	226
1997-12-31	745
1998-06-30	947
1998-12-31	611
1999-06-30	451