Bi-annual	US dollars
1987-06-30	281
1987-12-31	436
1988-06-30	391
1988-12-31	313
1989-06-30	370
1989-12-31	432
1990-06-30	417
1990-12-31	311
1991-06-30	271
1991-12-31	211
1992-06-30	186
1992-12-31	241
1993-06-30	392
1993-12-31	828
1994-06-30	421
1994-12-31	1173
1995-06-30	498
1995-12-31	667
1996-06-30	576
1996-12-31	550
1997-06-30	645
1997-12-31	1084
1998-06-30	892
1998-12-31	1348
1999-06-30	853