Bi-annual	US dollars
1987-06-30	705
1987-12-31	406
1988-06-30	508
1988-12-31	557
1989-06-30	609
1989-12-31	708
1990-06-30	696
1990-12-31	592
1991-06-30	644
1991-12-31	562
1992-06-30	447
1992-12-31	338
1993-06-30	572
1993-12-31	628
1994-06-30	559
1994-12-31	648
1995-06-30	504
1995-12-31	445
1996-06-30	381
1996-12-31	478
1997-06-30	597
1997-12-31	591
1998-06-30	597
1998-12-31	584
1999-06-30	424