Bi-annual	US dollars
1987-06-30	166
1987-12-31	130
1988-06-30	194
1988-12-31	128
1989-06-30	91
1989-12-31	53
1990-06-30	54
1990-12-31	42
1991-06-30	130
1991-12-31	177
1992-06-30	329
1992-12-31	165
1993-06-30	416
1993-12-31	336
1994-06-30	403
1994-12-31	499
1995-06-30	638
1995-12-31	723
1996-06-30	820
1996-12-31	503
1997-06-30	502
1997-12-31	663
1998-06-30	507
1998-12-31	458
1999-06-30	569