Bi-annual	US dollars
1987-06-30	766
1987-12-31	879
1988-06-30	1180
1988-12-31	720
1989-06-30	1048
1989-12-31	1090
1990-06-30	1350
1990-12-31	1387
1991-06-30	1203
1991-12-31	1281
1992-06-30	1372
1992-12-31	809
1993-06-30	606
1993-12-31	392
1994-06-30	574
1994-12-31	462
1995-06-30	598
1995-12-31	291
1996-06-30	339
1996-12-31	370
1997-06-30	286
1997-12-31	410
1998-06-30	298
1998-12-31	381
1999-06-30	415