Bi-annual	US dollars
1987-06-30	152
1987-12-31	77
1988-06-30	125
1988-12-31	83
1989-06-30	109
1989-12-31	105
1990-06-30	85
1990-12-31	129
1991-06-30	148
1991-12-31	202
1992-06-30	167
1992-12-31	264
1993-06-30	176
1993-12-31	368
1994-06-30	573
1994-12-31	427
1995-06-30	690
1995-12-31	285
1996-06-30	267
1996-12-31	363
1997-06-30	418
1997-12-31	352
1998-06-30	510
1998-12-31	238
1999-06-30	200