Bi-annual	US dollars
1987-06-30	313
1987-12-31	377
1988-06-30	264
1988-12-31	134
1989-06-30	298
1989-12-31	171
1990-06-30	396
1990-12-31	149
1991-06-30	225
1991-12-31	110
1992-06-30	468
1992-12-31	241
1993-06-30	192
1993-12-31	285
1994-06-30	290
1994-12-31	451
1995-06-30	423
1995-12-31	394
1996-06-30	244
1996-12-31	413
1997-06-30	501
1997-12-31	235
1998-06-30	637
1998-12-31	338
1999-06-30	311