Bi-annual	US dollars
1987-06-30	16
1987-12-31	45
1988-06-30	58
1988-12-31	43
1989-06-30	74
1989-12-31	84
1990-06-30	75
1990-12-31	71
1991-06-30	68
1991-12-31	69
1992-06-30	72
1992-12-31	112
1993-06-30	116
1993-12-31	192
1994-06-30	199
1994-12-31	191
1995-06-30	212
1995-12-31	175
1996-06-30	236
1996-12-31	267
1997-06-30	284
1997-12-31	296
1998-06-30	408
1998-12-31	383
1999-06-30	481