Bi-annual	US dollars
1987-06-30	1074
1987-12-31	996
1988-06-30	1371
1988-12-31	1273
1989-06-30	775
1989-12-31	764
1990-06-30	549
1990-12-31	309
1991-06-30	412
1991-12-31	693
1992-06-30	984
1992-12-31	809
1993-06-30	920
1993-12-31	879
1994-06-30	863
1994-12-31	831
1995-06-30	805
1995-12-31	884
1996-06-30	1290
1996-12-31	1493
1997-06-30	1033
1997-12-31	2187
1998-06-30	2344
1998-12-31	2037
1999-06-30	2061