Bi-annual	US dollars
1987-06-30	716
1987-12-31	698
1988-06-30	612
1988-12-31	743
1989-06-30	694
1989-12-31	522
1990-06-30	361
1990-12-31	309
1991-06-30	264
1991-12-31	275
1992-06-30	228
1992-12-31	174
1993-06-30	152
1993-12-31	139
1994-06-30	136
1994-12-31	135
1995-06-30	132
1995-12-31	127
1996-06-30	168
1996-12-31	137
1997-06-30	93
1997-12-31	58
1998-06-30	68
1998-12-31	40
1999-06-30	44