Bi-annual	US dollars
1987-06-30	50
1987-12-31	58
1988-06-30	116
1988-12-31	103
1989-06-30	124
1989-12-31	116
1990-06-30	1488
1990-12-31	3124
1991-06-30	2293
1991-12-31	3846
1992-06-30	3720
1992-12-31	3348
1993-06-30	4084
1993-12-31	3856
1994-06-30	4951
1994-12-31	5196
1995-06-30	4756
1995-12-31	4825
1996-06-30	4408
1996-12-31	4689
1997-06-30	4523
1997-12-31	4599
1998-06-30	4798
1998-12-31	5240
1999-06-30	3742