Bi-annual	US dollars
1987-06-30	16
1987-12-31	8
1988-06-30	24
1988-12-31	20
1989-06-30	11
1989-12-31	13
1990-06-30	12
1990-12-31	21
1991-06-30	19
1991-12-31	56
1992-06-30	42
1992-12-31	74
1993-06-30	56
1993-12-31	120
1994-06-30	137
1994-12-31	233
1995-06-30	153
1995-12-31	310
1996-06-30	351
1996-12-31	193
1997-06-30	171
1997-12-31	201
1998-06-30	60
1998-12-31	32
1999-06-30	28