Bi-annual	US dollars
1987-06-30	1013
1987-12-31	547
1988-06-30	672
1988-12-31	837
1989-06-30	460
1989-12-31	795
1990-06-30	1060
1990-12-31	967
1991-06-30	689
1991-12-31	557
1992-06-30	504
1992-12-31	508
1993-06-30	882
1993-12-31	758
1994-06-30	559
1994-12-31	871
1995-06-30	792
1995-12-31	932
1996-06-30	1248
1996-12-31	998
1997-06-30	1016
1997-12-31	1774
1998-06-30	682
1998-12-31	1741
1999-06-30	986