Bi-annual	US dollars
1987-06-30	977
1987-12-31	976
1988-06-30	854
1988-12-31	707
1989-06-30	685
1989-12-31	822
1990-06-30	800
1990-12-31	1279
1991-06-30	874
1991-12-31	758
1992-06-30	1010
1992-12-31	1227
1993-06-30	1289
1993-12-31	1398
1994-06-30	1466
1994-12-31	1381
1995-06-30	1235
1995-12-31	1126
1996-06-30	1094
1996-12-31	945
1997-06-30	989
1997-12-31	798
1998-06-30	1786
1998-12-31	1389
1999-06-30	1266