Bi-annual	US dollars
1987-06-30	485
1987-12-31	568
1988-06-30	602
1988-12-31	535
1989-06-30	451
1989-12-31	481
1990-06-30	542
1990-12-31	457
1991-06-30	363
1991-12-31	357
1992-06-30	32
1992-12-31	1268
1993-06-30	1675
1993-12-31	2823
1994-06-30	747
1994-12-31	853
1995-06-30	778
1995-12-31	687
1996-06-30	1046
1996-12-31	752
1997-06-30	987
1997-12-31	1073
1998-06-30	3571
1998-12-31	2493
1999-06-30	3385