Bi-annual	US dollars
1987-06-30	474
1987-12-31	466
1988-06-30	268
1988-12-31	566
1989-06-30	389
1989-12-31	360
1990-06-30	483
1990-12-31	617
1991-06-30	407
1991-12-31	544
1992-06-30	480
1992-12-31	424
1993-06-30	393
1993-12-31	445
1994-06-30	560
1994-12-31	318
1995-06-30	318
1995-12-31	375
1996-06-30	471
1996-12-31	282
1997-06-30	524
1997-12-31	711
1998-06-30	492
1998-12-31	371
1999-06-30	576