Bi-annual	US dollars
1987-06-30	363
1987-12-31	315
1988-06-30	326
1988-12-31	476
1989-06-30	470
1989-12-31	353
1990-06-30	457
1990-12-31	658
1991-06-30	397
1991-12-31	407
1992-06-30	611
1992-12-31	403
1993-06-30	692
1993-12-31	928
1994-06-30	1145
1994-12-31	4110
1995-06-30	4394
1995-12-31	4269
1996-06-30	5806
1996-12-31	4913
1997-06-30	4380
1997-12-31	1344
1998-06-30	1164
1998-12-31	980
1999-06-30	796