Bi-annual	US dollars
1987-06-30	35
1987-12-31	70
1988-06-30	135
1988-12-31	81
1989-06-30	25
1989-12-31	53
1990-06-30	87
1990-12-31	31
1991-06-30	54
1991-12-31	155
1992-06-30	259
1992-12-31	248
1993-06-30	438
1993-12-31	197
1994-06-30	434
1994-12-31	626
1995-06-30	266
1995-12-31	397
1996-06-30	373
1996-12-31	461
1997-06-30	687
1997-12-31	377
1998-06-30	430
1998-12-31	386
1999-06-30	475