Bi-annual	US dollars
1987-06-30	2133
1987-12-31	1898
1988-06-30	1874
1988-12-31	2123
1989-06-30	1327
1989-12-31	1703
1990-06-30	2091
1990-12-31	2273
1991-06-30	1390
1991-12-31	1304
1992-06-30	1591
1992-12-31	1277
1993-06-30	2281
1993-12-31	1985
1994-06-30	1826
1994-12-31	1882
1995-06-30	2095
1995-12-31	2375
1996-06-30	2323
1996-12-31	4886
1997-06-30	2720
1997-12-31	3658
1998-06-30	2261
1998-12-31	3649
1999-06-30	2830