Bi-annual	US dollars
1987-06-30	2175
1987-12-31	2155
1988-06-30	2139
1988-12-31	2240
1989-06-30	2246
1989-12-31	1804
1990-06-30	1838
1990-12-31	1962
1991-06-30	1886
1991-12-31	1900
1992-06-30	2088
1992-12-31	2009
1993-06-30	1646
1993-12-31	1707
1994-06-30	1556
1994-12-31	1355
1995-06-30	1381
1995-12-31	1419
1996-06-30	1246
1996-12-31	1205
1997-06-30	1193
1997-12-31	1120
1998-06-30	1409
1998-12-31	1354
1999-06-30	1307