Bi-annual	US dollars
1987-06-30	2775
1987-12-31	3102
1988-06-30	3201
1988-12-31	2537
1989-06-30	2488
1989-12-31	2433
1990-06-30	1894
1990-12-31	1787
1991-06-30	1403
1991-12-31	2148
1992-06-30	1970
1992-12-31	2872
1993-06-30	2428
1993-12-31	2891
1994-06-30	2917
1994-12-31	4071
1995-06-30	4547
1995-12-31	3977
1996-06-30	4394
1996-12-31	5316
1997-06-30	5723
1997-12-31	8355
1998-06-30	7203
1998-12-31	6804
1999-06-30	6605