Bi-annual	US dollars
1987-06-30	461
1987-12-31	430
1988-06-30	377
1988-12-31	340
1989-06-30	229
1989-12-31	268
1990-06-30	272
1990-12-31	311
1991-06-30	306
1991-12-31	374
1992-06-30	419
1992-12-31	468
1993-06-30	477
1993-12-31	417
1994-06-30	543
1994-12-31	510
1995-06-30	542
1995-12-31	471
1996-06-30	441
1996-12-31	392
1997-06-30	376
1997-12-31	492
1998-06-30	507
1998-12-31	524
1999-06-30	763