Bi-annual	US dollars
1987-06-30	216
1987-12-31	257
1988-06-30	251
1988-12-31	282
1989-06-30	293
1989-12-31	335
1990-06-30	361
1990-12-31	396
1991-06-30	358
1991-12-31	260
1992-06-30	276
1992-12-31	333
1993-06-30	287
1993-12-31	324
1994-06-30	360
1994-12-31	407
1995-06-30	460
1995-12-31	518
1996-06-30	1029
1996-12-31	978
1997-06-30	968
1997-12-31	859
1998-06-30	774
1998-12-31	749
1999-06-30	626