Bi-annual	US dollars
1987-06-30	103
1987-12-31	128
1988-06-30	90
1988-12-31	127
1989-06-30	98
1989-12-31	82
1990-06-30	140
1990-12-31	60
1991-06-30	114
1991-12-31	125
1992-06-30	200
1992-12-31	195
1993-06-30	1026
1993-12-31	275
1994-06-30	285
1994-12-31	372
1995-06-30	517
1995-12-31	416
1996-06-30	409
1996-12-31	430
1997-06-30	496
1997-12-31	1754
1998-06-30	700
1998-12-31	564
1999-06-30	760