Bi-annual	US dollars
1987-06-30	651
1987-12-31	840
1988-06-30	711
1988-12-31	358
1989-06-30	794
1989-12-31	545
1990-06-30	706
1990-12-31	627
1991-06-30	238
1991-12-31	233
1992-06-30	710
1992-12-31	503
1993-06-30	432
1993-12-31	522
1994-06-30	769
1994-12-31	526
1995-06-30	1031
1995-12-31	955
1996-06-30	971
1996-12-31	416
1997-06-30	770
1997-12-31	499
1998-06-30	875
1998-12-31	135
1999-06-30	377