Bi-annual	US dollars
1987-06-30	206
1987-12-31	208
1988-06-30	263
1988-12-31	246
1989-06-30	488
1989-12-31	537
1990-06-30	528
1990-12-31	577
1991-06-30	511
1991-12-31	478
1992-06-30	377
1992-12-31	317
1993-06-30	342
1993-12-31	582
1994-06-30	576
1994-12-31	513
1995-06-30	533
1995-12-31	513
1996-06-30	580
1996-12-31	1003
1997-06-30	1130
1997-12-31	2035
1998-06-30	2716
1998-12-31	1702
1999-06-30	1768