Bi-annual	US dollars
1987-06-30	595
1987-12-31	640
1988-06-30	796
1988-12-31	537
1989-06-30	701
1989-12-31	429
1990-06-30	375
1990-12-31	436
1991-06-30	477
1991-12-31	700
1992-06-30	797
1992-12-31	774
1993-06-30	1377
1993-12-31	1092
1994-06-30	957
1994-12-31	1120
1995-06-30	694
1995-12-31	1043
1996-06-30	1492
1996-12-31	1313
1997-06-30	2153
1997-12-31	4947
1998-06-30	6414
1998-12-31	8139
1999-06-30	9081