Bi-annual	US dollars
1987-06-30	1791
1987-12-31	1929
1988-06-30	2395
1988-12-31	2732
1989-06-30	2589
1989-12-31	2067
1990-06-30	2040
1990-12-31	1729
1991-06-30	1602
1991-12-31	1591
1992-06-30	1532
1992-12-31	1385
1993-06-30	159
1993-12-31	340
1994-06-30	390
1994-12-31	329
1995-06-30	340
1995-12-31	282
1996-06-30	232
1996-12-31	130
1997-06-30	383
1997-12-31	987
1998-06-30	1004
1998-12-31	1018
1999-06-30	927