Bi-annual	US dollars
1987-06-30	339
1987-12-31	438
1988-06-30	517
1988-12-31	432
1989-06-30	493
1989-12-31	556
1990-06-30	555
1990-12-31	575
1991-06-30	671
1991-12-31	566
1992-06-30	657
1992-12-31	612
1993-06-30	1148
1993-12-31	1017
1994-06-30	1153
1994-12-31	1845
1995-06-30	1613
1995-12-31	1811
1996-06-30	1754
1996-12-31	1854
1997-06-30	2040
1997-12-31	2924
1998-06-30	2396
1998-12-31	2599
1999-06-30	2133