Bi-annual	US dollars
1987-06-30	553
1987-12-31	398
1988-06-30	479
1988-12-31	389
1989-06-30	577
1989-12-31	468
1990-06-30	426
1990-12-31	891
1991-06-30	960
1991-12-31	1020
1992-06-30	891
1992-12-31	739
1993-06-30	614
1993-12-31	772
1994-06-30	759
1994-12-31	1128
1995-06-30	1563
1995-12-31	1932
1996-06-30	1872
1996-12-31	2212
1997-06-30	2183
1997-12-31	3312
1998-06-30	3997
1998-12-31	4250
1999-06-30	4939