Bi-annual	US dollars
1987-06-30	1032
1987-12-31	2179
1988-06-30	1590
1988-12-31	2967
1989-06-30	1282
1989-12-31	1821
1990-06-30	2382
1990-12-31	1955
1991-06-30	1667
1991-12-31	2150
1992-06-30	499
1992-12-31	362
1993-06-30	621
1993-12-31	387
1994-06-30	225
1994-12-31	299
1995-06-30	347
1995-12-31	406
1996-06-30	869
1996-12-31	707
1997-06-30	832
1997-12-31	413
1998-06-30	589
1998-12-31	674
1999-06-30	1361