Bi-annual	US dollars
1987-06-30	526
1987-12-31	740
1988-06-30	667
1988-12-31	786
1989-06-30	698
1989-12-31	745
1990-06-30	712
1990-12-31	492
1991-06-30	473
1991-12-31	487
1992-06-30	580
1992-12-31	535
1993-06-30	873
1993-12-31	1150
1994-06-30	864
1994-12-31	1771
1995-06-30	794
1995-12-31	1051
1996-06-30	934
1996-12-31	837
1997-06-30	1046
1997-12-31	1665
1998-06-30	1737
1998-12-31	2270
1999-06-30	1865