Bi-annual	US dollars
1987-06-30	551
1987-12-31	615
1988-06-30	599
1988-12-31	633
1989-06-30	572
1989-12-31	568
1990-06-30	562
1990-12-31	573
1991-06-30	485
1991-12-31	486
1992-06-30	474
1992-12-31	353
1993-06-30	353
1993-12-31	624
1994-06-30	671
1994-12-31	654
1995-06-30	667
1995-12-31	716
1996-06-30	768
1996-12-31	991
1997-06-30	1031
1997-12-31	1071
1998-06-30	1394
1998-12-31	1301
1999-06-30	1313