Bi-annual	US dollars
1987-06-30	674
1987-12-31	759
1988-06-30	665
1988-12-31	465
1989-06-30	606
1989-12-31	540
1990-06-30	603
1990-12-31	629
1991-06-30	809
1991-12-31	773
1992-06-30	976
1992-12-31	918
1993-06-30	1373
1993-12-31	1434
1994-06-30	1415
1994-12-31	1683
1995-06-30	1704
1995-12-31	2002
1996-06-30	2237
1996-12-31	2503
1997-06-30	2747
1997-12-31	3129
1998-06-30	2694
1998-12-31	2371
1999-06-30	2573