Bi-annual	US dollars
1987-06-30	819
1987-12-31	893
1988-06-30	788
1988-12-31	640
1989-06-30	674
1989-12-31	648
1990-06-30	717
1990-12-31	303
1991-06-30	237
1991-12-31	267
1992-06-30	225
1992-12-31	258
1993-06-30	636
1993-12-31	432
1994-06-30	389
1994-12-31	374
1995-06-30	500
1995-12-31	450
1996-06-30	489
1996-12-31	390
1997-06-30	512
1997-12-31	576
1998-06-30	602
1998-12-31	609
1999-06-30	617