Bi-annual	US dollars
1987-06-30	185
1987-12-31	440
1988-06-30	571
1988-12-31	510
1989-06-30	265
1989-12-31	352
1990-06-30	276
1990-12-31	552
1991-06-30	266
1991-12-31	934
1992-06-30	807
1992-12-31	1057
1993-06-30	4240
1993-12-31	4274
1994-06-30	1807
1994-12-31	1585
1995-06-30	2041
1995-12-31	2842
1996-06-30	2282
1996-12-31	4542
1997-06-30	4427
1997-12-31	2981
1998-06-30	6979
1998-12-31	4054
1999-06-30	1452