Bi-annual	US dollars
1987-06-30	5989
1987-12-31	5806
1988-06-30	5713
1988-12-31	6964
1989-06-30	3958
1989-12-31	4081
1990-06-30	3479
1990-12-31	2107
1991-06-30	1858
1991-12-31	2691
1992-06-30	2360
1992-12-31	2095
1993-06-30	2270
1993-12-31	2885
1994-06-30	4029
1994-12-31	2343
1995-06-30	2479
1995-12-31	2212
1996-06-30	2331
1996-12-31	2044
1997-06-30	2825
1997-12-31	2537
1998-06-30	3075
1998-12-31	2584
1999-06-30	2922