Bi-annual	US dollars
1987-06-30	3125
1987-12-31	3334
1988-06-30	3184
1988-12-31	3220
1989-06-30	2440
1989-12-31	2499
1990-06-30	2356
1990-12-31	2298
1991-06-30	1866
1991-12-31	1972
1992-06-30	2029
1992-12-31	1760
1993-06-30	1573
1993-12-31	1441
1994-06-30	1435
1994-12-31	1353
1995-06-30	899
1995-12-31	932
1996-06-30	996
1996-12-31	1015
1997-06-30	1194
1997-12-31	1063
1998-06-30	670
1998-12-31	684
1999-06-30	593