Bi-annual	US dollars
1987-06-30	801
1987-12-31	587
1988-06-30	527
1988-12-31	466
1989-06-30	570
1989-12-31	411
1990-06-30	572
1990-12-31	392
1991-06-30	555
1991-12-31	779
1992-06-30	984
1992-12-31	729
1993-06-30	1855
1993-12-31	2746
1994-06-30	2498
1994-12-31	2836
1995-06-30	3013
1995-12-31	3427
1996-06-30	3289
1996-12-31	2773
1997-06-30	3161
1997-12-31	2966
1998-06-30	3453
1998-12-31	3331
1999-06-30	2395