Bi-annual	US dollars
1987-06-30	2646
1987-12-31	3032
1988-06-30	2686
1988-12-31	3009
1989-06-30	2229
1989-12-31	2241
1990-06-30	1709
1990-12-31	1546
1991-06-30	1378
1991-12-31	1253
1992-06-30	1281
1992-12-31	1074
1993-06-30	1458
1993-12-31	1375
1994-06-30	1242
1994-12-31	835
1995-06-30	904
1995-12-31	723
1996-06-30	671
1996-12-31	786
1997-06-30	988
1997-12-31	907
1998-06-30	1027
1998-12-31	993
1999-06-30	1006