Bi-annual	US dollars
1987-06-30	113
1987-12-31	170
1988-06-30	160
1988-12-31	183
1989-06-30	93
1989-12-31	148
1990-06-30	173
1990-12-31	216
1991-06-30	118
1991-12-31	219
1992-06-30	122
1992-12-31	70
1993-06-30	273
1993-12-31	302
1994-06-30	369
1994-12-31	311
1995-06-30	307
1995-12-31	254
1996-06-30	446
1996-12-31	406
1997-06-30	491
1997-12-31	443
1998-06-30	273
1998-12-31	275
1999-06-30	293