Bi-annual	US dollars
1987-06-30	988
1987-12-31	902
1988-06-30	902
1988-12-31	815
1989-06-30	837
1989-12-31	845
1990-06-30	1453
1990-12-31	1362
1991-06-30	1057
1991-12-31	1143
1992-06-30	1170
1992-12-31	1453
1993-06-30	1550
1993-12-31	1454
1994-06-30	2543
1994-12-31	3946
1995-06-30	4386
1995-12-31	4887
1996-06-30	5113
1996-12-31	1382
1997-06-30	2233
1997-12-31	3024
1998-06-30	3311
1998-12-31	2742
1999-06-30	2424