Bi-annual	US dollars
1987-06-30	163
1987-12-31	128
1988-06-30	85
1988-12-31	65
1989-06-30	174
1989-12-31	34
1990-06-30	51
1990-12-31	69
1991-06-30	83
1991-12-31	185
1992-06-30	228
1992-12-31	341
1993-06-30	494
1993-12-31	511
1994-06-30	606
1994-12-31	413
1995-06-30	220
1995-12-31	443
1996-06-30	432
1996-12-31	476
1997-06-30	1016
1997-12-31	587
1998-06-30	228
1998-12-31	278
1999-06-30	132