Bi-annual	US dollars
1987-06-30	18
1987-12-31	17
1988-06-30	12
1988-12-31	7
1989-06-30	6
1989-12-31	6
1990-06-30	9
1990-12-31	14
1991-06-30	10
1991-12-31	19
1992-06-30	17
1992-12-31	15
1993-06-30	261
1993-12-31	310
1994-06-30	292
1994-12-31	283
1995-06-30	301
1995-12-31	313
1996-06-30	367
1996-12-31	401
1997-06-30	426
1997-12-31	410
1998-06-30	435
1998-12-31	414
1999-06-30	396