Bi-annual	US dollars
1987-06-30	79
1987-12-31	142
1988-06-30	230
1988-12-31	324
1989-06-30	318
1989-12-31	353
1990-06-30	232
1990-12-31	262
1991-06-30	266
1991-12-31	398
1992-06-30	268
1992-12-31	245
1993-06-30	450
1993-12-31	965
1994-06-30	528
1994-12-31	507
1995-06-30	430
1995-12-31	532
1996-06-30	592
1996-12-31	522
1997-06-30	664
1997-12-31	785
1998-06-30	654
1998-12-31	446
1999-06-30	840