Bi-annual	US dollars
1987-06-30	1514
1987-12-31	1636
1988-06-30	1866
1988-12-31	1817
1989-06-30	1606
1989-12-31	1563
1990-06-30	1540
1990-12-31	1405
1991-06-30	1195
1991-12-31	1296
1992-06-30	1220
1992-12-31	1444
1993-06-30	1173
1993-12-31	1052
1994-06-30	775
1994-12-31	743
1995-06-30	608
1995-12-31	460
1996-06-30	444
1996-12-31	298
1997-06-30	289
1997-12-31	171
1998-06-30	392
1998-12-31	323
1999-06-30	323