Bi-annual	US dollars
1987-06-30	293
1987-12-31	596
1988-06-30	1349
1988-12-31	1851
1989-06-30	1470
1989-12-31	1740
1990-06-30	788
1990-12-31	695
1991-06-30	480
1991-12-31	1334
1992-06-30	1492
1992-12-31	1341
1993-06-30	1497
1993-12-31	865
1994-06-30	722
1994-12-31	990
1995-06-30	818
1995-12-31	668
1996-06-30	621
1996-12-31	657
1997-06-30	416
1997-12-31	647
1998-06-30	685
1998-12-31	784
1999-06-30	1260