Bi-annual	US dollars
1987-06-30	232
1987-12-31	209
1988-06-30	285
1988-12-31	324
1989-06-30	203
1989-12-31	273
1990-06-30	457
1990-12-31	187
1991-06-30	225
1991-12-31	331
1992-06-30	169
1992-12-31	171
1993-06-30	228
1993-12-31	263
1994-06-30	255
1994-12-31	283
1995-06-30	196
1995-12-31	375
1996-06-30	367
1996-12-31	269
1997-06-30	449
1997-12-31	1058
1998-06-30	922
1998-12-31	333
1999-06-30	282