Bi-annual	US dollars
1987-06-30	1616
1987-12-31	1953
1988-06-30	2748
1988-12-31	2631
1989-06-30	3260
1989-12-31	4025
1990-06-30	4498
1990-12-31	6012
1991-06-30	5310
1991-12-31	6879
1992-06-30	7014
1992-12-31	6301
1993-06-30	6415
1993-12-31	4644
1994-06-30	4241
1994-12-31	4109
1995-06-30	4801
1995-12-31	4275
1996-06-30	5663
1996-12-31	4831
1997-06-30	4473
1997-12-31	5648
1998-06-30	6376
1998-12-31	7400
1999-06-30	6799