Bi-annual	US dollars
1987-06-30	156
1987-12-31	196
1988-06-30	194
1988-12-31	103
1989-06-30	73
1989-12-31	116
1990-06-30	92
1990-12-31	139
1991-06-30	185
1991-12-31	144
1992-06-30	154
1992-12-31	117
1993-06-30	189
1993-12-31	174
1994-06-30	228
1994-12-31	116
1995-06-30	472
1995-12-31	271
1996-06-30	275
1996-12-31	253
1997-06-30	276
1997-12-31	517
1998-06-30	363
1998-12-31	319
1999-06-30	525