Bi-annual	US dollars
1987-06-30	1574
1987-12-31	1662
1988-06-30	1627
1988-12-31	1857
1989-06-30	1449
1989-12-31	1488
1990-06-30	1209
1990-12-31	1370
1991-06-30	955
1991-12-31	990
1992-06-30	936
1992-12-31	741
1993-06-30	929
1993-12-31	1005
1994-06-30	1066
1994-12-31	1668
1995-06-30	1839
1995-12-31	1597
1996-06-30	1425
1996-12-31	1310
1997-06-30	1457
1997-12-31	1459
1998-06-30	1157
1998-12-31	1183
1999-06-30	1222