Bi-annual	US dollars
1987-06-30	327
1987-12-31	332
1988-06-30	295
1988-12-31	311
1989-06-30	74
1989-12-31	113
1990-06-30	124
1990-12-31	189
1991-06-30	126
1991-12-31	121
1992-06-30	114
1992-12-31	162
1993-06-30	317
1993-12-31	253
1994-06-30	301
1994-12-31	368
1995-06-30	549
1995-12-31	800
1996-06-30	965
1996-12-31	938
1997-06-30	1098
1997-12-31	1423
1998-06-30	1424
1998-12-31	1226
1999-06-30	1138