Bi-annual	US dollars
1987-06-30	416
1987-12-31	549
1988-06-30	464
1988-12-31	588
1989-06-30	468
1989-12-31	487
1990-06-30	462
1990-12-31	370
1991-06-30	316
1991-12-31	304
1992-06-30	314
1992-12-31	380
1993-06-30	531
1993-12-31	936
1994-06-30	617
1994-12-31	1626
1995-06-30	1064
1995-12-31	1036
1996-06-30	848
1996-12-31	803
1997-06-30	915
1997-12-31	1561
1998-06-30	1596
1998-12-31	2163
1999-06-30	1733