Bi-annual	US dollars
1987-06-30	637
1987-12-31	602
1988-06-30	568
1988-12-31	611
1989-06-30	471
1989-12-31	450
1990-06-30	337
1990-12-31	293
1991-06-30	276
1991-12-31	276
1992-06-30	268
1992-12-31	218
1993-06-30	170
1993-12-31	114
1994-06-30	96
1994-12-31	30
1995-06-30	134
1995-12-31	180
1996-06-30	123
1996-12-31	115
1997-06-30	329
1997-12-31	194
1998-06-30	567
1998-12-31	444
1999-06-30	173