Bi-annual	US dollars
1987-06-30	519
1987-12-31	545
1988-06-30	476
1988-12-31	439
1989-06-30	417
1989-12-31	514
1990-06-30	424
1990-12-31	490
1991-06-30	381
1991-12-31	786
1992-06-30	438
1992-12-31	470
1993-06-30	932
1993-12-31	978
1994-06-30	1270
1994-12-31	1610
1995-06-30	1629
1995-12-31	1490
1996-06-30	1934
1996-12-31	2048
1997-06-30	2136
1997-12-31	3003
1998-06-30	2198
1998-12-31	1646
1999-06-30	2559