Bi-annual	US dollars
1987-06-30	853
1987-12-31	1017
1988-06-30	858
1988-12-31	1282
1989-06-30	1187
1989-12-31	1188
1990-06-30	1043
1990-12-31	247
1991-06-30	384
1991-12-31	314
1992-06-30	457
1992-12-31	691
1993-06-30	522
1993-12-31	646
1994-06-30	591
1994-12-31	515
1995-06-30	383
1995-12-31	332
1996-06-30	607
1996-12-31	358
1997-06-30	810
1997-12-31	1124
1998-06-30	540
1998-12-31	835
1999-06-30	577