Bi-annual	US dollars
1987-06-30	1014
1987-12-31	959
1988-06-30	970
1988-12-31	642
1989-06-30	603
1989-12-31	734
1990-06-30	964
1990-12-31	988
1991-06-30	1536
1991-12-31	1778
1992-06-30	2198
1992-12-31	2527
1993-06-30	3033
1993-12-31	3457
1994-06-30	5353
1994-12-31	4848
1995-06-30	4026
1995-12-31	5659
1996-06-30	5059
1996-12-31	5949
1997-06-30	7529
1997-12-31	7052
1998-06-30	5999
1998-12-31	8681
1999-06-30	4235