Bi-annual	US dollars
1987-06-30	371
1987-12-31	568
1988-06-30	467
1988-12-31	457
1989-06-30	451
1989-12-31	219
1990-06-30	98
1990-12-31	122
1991-06-30	99
1991-12-31	106
1992-06-30	114
1992-12-31	132
1993-06-30	131
1993-12-31	101
1994-06-30	133
1994-12-31	131
1995-06-30	115
1995-12-31	191
1996-06-30	149
1996-12-31	181
1997-06-30	150
1997-12-31	112
1998-06-30	522
1998-12-31	329
1999-06-30	136