Bi-annual	US dollars
1987-06-30	234
1987-12-31	723
1988-06-30	641
1988-12-31	843
1989-06-30	592
1989-12-31	693
1990-06-30	924
1990-12-31	710
1991-06-30	833
1991-12-31	1315
1992-06-30	723
1992-12-31	603
1993-06-30	576
1993-12-31	371
1994-06-30	400
1994-12-31	466
1995-06-30	511
1995-12-31	1092
1996-06-30	920
1996-12-31	688
1997-06-30	707
1997-12-31	681
1998-06-30	559
1998-12-31	639
1999-06-30	609