Bi-annual	US dollars
1987-06-30	1425
1987-12-31	1394
1988-06-30	1352
1988-12-31	1351
1989-06-30	1172
1989-12-31	906
1990-06-30	753
1990-12-31	772
1991-06-30	676
1991-12-31	667
1992-06-30	636
1992-12-31	701
1993-06-30	803
1993-12-31	715
1994-06-30	606
1994-12-31	629
1995-06-30	647
1995-12-31	631
1996-06-30	782
1996-12-31	1173
1997-06-30	1076
1997-12-31	1603
1998-06-30	1767
1998-12-31	1825
1999-06-30	1739