Bi-annual	US dollars
1987-06-30	211
1987-12-31	306
1988-06-30	227
1988-12-31	219
1989-06-30	197
1989-12-31	171
1990-06-30	145
1990-12-31	141
1991-06-30	114
1991-12-31	133
1992-06-30	135
1992-12-31	106
1993-06-30	56
1993-12-31	99
1994-06-30	94
1994-12-31	131
1995-06-30	167
1995-12-31	197
1996-06-30	179
1996-12-31	291
1997-06-30	527
1997-12-31	245
1998-06-30	222
1998-12-31	421
1999-06-30	158