Bi-annual	US dollars
1987-06-30	924
1987-12-31	1045
1988-06-30	1022
1988-12-31	1166
1989-06-30	1285
1989-12-31	1575
1990-06-30	1659
1990-12-31	1760
1991-06-30	1574
1991-12-31	1754
1992-06-30	1996
1992-12-31	1956
1993-06-30	1961
1993-12-31	1839
1994-06-30	1838
1994-12-31	1776
1995-06-30	1860
1995-12-31	1840
1996-06-30	2110
1996-12-31	1614
1997-06-30	1848
1997-12-31	3312
1998-06-30	4852
1998-12-31	4910
1999-06-30	6066