Bi-annual	US dollars
1987-06-30	39
1987-12-31	49
1988-06-30	36
1988-12-31	224
1989-06-30	25
1989-12-31	16
1990-06-30	23
1990-12-31	17
1991-06-30	19
1991-12-31	69
1992-06-30	57
1992-12-31	59
1993-06-30	42
1993-12-31	50
1994-06-30	105
1994-12-31	152
1995-06-30	240
1995-12-31	91
1996-06-30	76
1996-12-31	91
1997-06-30	131
1997-12-31	280
1998-06-30	390
1998-12-31	586
1999-06-30	541