Bi-annual	US dollars
1987-06-30	2153
1987-12-31	757
1988-06-30	1069
1988-12-31	890
1989-06-30	980
1989-12-31	1034
1990-06-30	1561
1990-12-31	1584
1991-06-30	1377
1991-12-31	2111
1992-06-30	1998
1992-12-31	1527
1993-06-30	3006
1993-12-31	3572
1994-06-30	2449
1994-12-31	2433
1995-06-30	2309
1995-12-31	2760
1996-06-30	2907
1996-12-31	3330
1997-06-30	4034
1997-12-31	6455
1998-06-30	5592
1998-12-31	5561
1999-06-30	5563