Bi-annual	US dollars
1987-06-30	2675
1987-12-31	2008
1988-06-30	2204
1988-12-31	2072
1989-06-30	2561
1989-12-31	2219
1990-06-30	3601
1990-12-31	4089
1991-06-30	3879
1991-12-31	4102
1992-06-30	3949
1992-12-31	2677
1993-06-30	2659
1993-12-31	2737
1994-06-30	2400
1994-12-31	2984
1995-06-30	3037
1995-12-31	2874
1996-06-30	3205
1996-12-31	4057
1997-06-30	3991
1997-12-31	4436
1998-06-30	6871
1998-12-31	6849
1999-06-30	8899