Bi-annual	US dollars
1987-06-30	148
1987-12-31	202
1988-06-30	123
1988-12-31	184
1989-06-30	186
1989-12-31	145
1990-06-30	180
1990-12-31	185
1991-06-30	289
1991-12-31	181
1992-06-30	202
1992-12-31	212
1993-06-30	131
1993-12-31	171
1994-06-30	156
1994-12-31	369
1995-06-30	568
1995-12-31	585
1996-06-30	1064
1996-12-31	1058
1997-06-30	915
1997-12-31	956
1998-06-30	799
1998-12-31	755
1999-06-30	738