Bi-annual	US dollars
1987-06-30	445
1987-12-31	472
1988-06-30	430
1988-12-31	410
1989-06-30	352
1989-12-31	161
1990-06-30	391
1990-12-31	349
1991-06-30	86
1991-12-31	303
1992-06-30	304
1992-12-31	238
1993-06-30	231
1993-12-31	467
1994-06-30	290
1994-12-31	447
1995-06-30	472
1995-12-31	448
1996-06-30	376
1996-12-31	423
1997-06-30	336
1997-12-31	271
1998-06-30	263
1998-12-31	258
1999-06-30	279