Bi-annual	US dollars
1987-06-30	6221
1987-12-31	6193
1988-06-30	5901
1988-12-31	5757
1989-06-30	5525
1989-12-31	4875
1990-06-30	2414
1990-12-31	1175
1991-06-30	2038
1991-12-31	975
1992-06-30	1060
1992-12-31	1165
1993-06-30	1627
1993-12-31	1836
1994-06-30	1687
1994-12-31	1915
1995-06-30	2136
1995-12-31	1887
1996-06-30	1683
1996-12-31	1962
1997-06-30	2188
1997-12-31	2608
1998-06-30	2899
1998-12-31	2907
1999-06-30	2558