Bi-annual	US dollars
1987-06-30	94
1987-12-31	125
1988-06-30	126
1988-12-31	226
1989-06-30	251
1989-12-31	181
1990-06-30	180
1990-12-31	224
1991-06-30	225
1991-12-31	179
1992-06-30	183
1992-12-31	153
1993-06-30	302
1993-12-31	705
1994-06-30	1056
1994-12-31	1381
1995-06-30	1001
1995-12-31	1124
1996-06-30	1282
1996-12-31	1317
1997-06-30	1348
1997-12-31	1451
1998-06-30	1874
1998-12-31	1824
1999-06-30	1660