Bi-annual	US dollars
1987-06-30	331
1987-12-31	379
1988-06-30	409
1988-12-31	333
1989-06-30	414
1989-12-31	274
1990-06-30	262
1990-12-31	295
1991-06-30	284
1991-12-31	390
1992-06-30	499
1992-12-31	426
1993-06-30	737
1993-12-31	610
1994-06-30	568
1994-12-31	688
1995-06-30	380
1995-12-31	564
1996-06-30	1175
1996-12-31	901
1997-06-30	1226
1997-12-31	2835
1998-06-30	3388
1998-12-31	4470
1999-06-30	5937