Bi-annual	US dollars
1987-06-30	572
1987-12-31	470
1988-06-30	440
1988-12-31	405
1989-06-30	352
1989-12-31	348
1990-06-30	394
1990-12-31	106
1991-06-30	96
1991-12-31	114
1992-06-30	160
1992-12-31	188
1993-06-30	162
1993-12-31	217
1994-06-30	244
1994-12-31	255
1995-06-30	181
1995-12-31	219
1996-06-30	163
1996-12-31	159
1997-06-30	125
1997-12-31	138
1998-06-30	292
1998-12-31	359
1999-06-30	421