Bi-annual	US dollars
1987-06-30	2066
1987-12-31	2132
1988-06-30	1540
1988-12-31	1663
1989-06-30	941
1989-12-31	514
1990-06-30	464
1990-12-31	311
1991-06-30	446
1991-12-31	360
1992-06-30	308
1992-12-31	406
1993-06-30	342
1993-12-31	656
1994-06-30	835
1994-12-31	718
1995-06-30	299
1995-12-31	278
1996-06-30	552
1996-12-31	714
1997-06-30	877
1997-12-31	791
1998-06-30	1376
1998-12-31	1426
1999-06-30	1198