Bi-annual	US dollars
1987-06-30	1142
1987-12-31	1198
1988-06-30	1105
1988-12-31	1087
1989-06-30	891
1989-12-31	872
1990-06-30	717
1990-12-31	843
1991-06-30	722
1991-12-31	811
1992-06-30	725
1992-12-31	874
1993-06-30	825
1993-12-31	900
1994-06-30	875
1994-12-31	1137
1995-06-30	862
1995-12-31	1133
1996-06-30	1128
1996-12-31	1407
1997-06-30	1843
1997-12-31	2022
1998-06-30	1987
1998-12-31	2032
1999-06-30	2085