Bi-annual	US dollars
1987-06-30	2612
1987-12-31	2753
1988-06-30	2882
1988-12-31	3188
1989-06-30	3334
1989-12-31	3448
1990-06-30	3364
1990-12-31	2379
1991-06-30	1652
1991-12-31	1685
1992-06-30	1722
1992-12-31	1560
1993-06-30	1482
1993-12-31	1499
1994-06-30	1394
1994-12-31	983
1995-06-30	842
1995-12-31	980
1996-06-30	1001
1996-12-31	-58
1997-06-30	1175
1997-12-31	1887
1998-06-30	772
1998-12-31	296
1999-06-30	233