Bi-annual	US dollars
1987-06-30	555
1987-12-31	721
1988-06-30	723
1988-12-31	725
1989-06-30	471
1989-12-31	256
1990-06-30	263
1990-12-31	251
1991-06-30	379
1991-12-31	417
1992-06-30	405
1992-12-31	318
1993-06-30	372
1993-12-31	358
1994-06-30	356
1994-12-31	307
1995-06-30	293
1995-12-31	262
1996-06-30	98
1996-12-31	115
1997-06-30	146
1997-12-31	117
1998-06-30	325
1998-12-31	433
1999-06-30	468