Bi-annual	US dollars
1987-06-30	240
1987-12-31	302
1988-06-30	293
1988-12-31	367
1989-06-30	350
1989-12-31	379
1990-06-30	473
1990-12-31	654
1991-06-30	1033
1991-12-31	902
1992-06-30	797
1992-12-31	644
1993-06-30	639
1993-12-31	656
1994-06-30	636
1994-12-31	993
1995-06-30	1079
1995-12-31	1071
1996-06-30	1005
1996-12-31	2044
1997-06-30	2055
1997-12-31	2257
1998-06-30	2283
1998-12-31	2674
1999-06-30	2116