Bi-annual	US dollars
1987-06-30	432
1987-12-31	442
1988-06-30	341
1988-12-31	233
1989-06-30	254
1989-12-31	194
1990-06-30	181
1990-12-31	125
1991-06-30	78
1991-12-31	92
1992-06-30	76
1992-12-31	71
1993-06-30	83
1993-12-31	266
1994-06-30	270
1994-12-31	264
1995-06-30	269
1995-12-31	329
1996-06-30	255
1996-12-31	334
1997-06-30	301
1997-12-31	309
1998-06-30	337
1998-12-31	378
1999-06-30	416