Bi-annual	US dollars
1987-06-30	23
1987-12-31	17
1988-06-30	14
1988-12-31	105
1989-06-30	118
1989-12-31	190
1990-06-30	180
1990-12-31	164
1991-06-30	198
1991-12-31	211
1992-06-30	211
1992-12-31	251
1993-06-30	173
1993-12-31	245
1994-06-30	215
1994-12-31	189
1995-06-30	196
1995-12-31	245
1996-06-30	249
1996-12-31	262
1997-06-30	221
1997-12-31	23
1998-06-30	33
1998-12-31	47
1999-06-30	16