Bi-annual	US dollars
1987-06-30	342
1987-12-31	330
1988-06-30	356
1988-12-31	329
1989-06-30	305
1989-12-31	266
1990-06-30	188
1990-12-31	257
1991-06-30	201
1991-12-31	151
1992-06-30	223
1992-12-31	158
1993-06-30	183
1993-12-31	123
1994-06-30	123
1994-12-31	249
1995-06-30	360
1995-12-31	299
1996-06-30	264
1996-12-31	337
1997-06-30	255
1997-12-31	186
1998-06-30	217
1998-12-31	256
1999-06-30	312