Bi-annual	US dollars
1987-06-30	771
1987-12-31	566
1988-06-30	508
1988-12-31	532
1989-06-30	366
1989-12-31	416
1990-06-30	445
1990-12-31	457
1991-06-30	381
1991-12-31	549
1992-06-30	510
1992-12-31	512
1993-06-30	587
1993-12-31	474
1994-06-30	546
1994-12-31	743
1995-06-30	700
1995-12-31	574
1996-06-30	724
1996-12-31	1000
1997-06-30	1140
1997-12-31	1158
1998-06-30	1836
1998-12-31	2185
1999-06-30	1761