Bi-annual	US dollars
1987-06-30	363
1987-12-31	443
1988-06-30	452
1988-12-31	517
1989-06-30	468
1989-12-31	501
1990-06-30	504
1990-12-31	513
1991-06-30	435
1991-12-31	454
1992-06-30	426
1992-12-31	314
1993-06-30	287
1993-12-31	312
1994-06-30	326
1994-12-31	418
1995-06-30	409
1995-12-31	422
1996-06-30	332
1996-12-31	332
1997-06-30	356
1997-12-31	373
1998-06-30	492
1998-12-31	334
1999-06-30	334