Bi-annual	US dollars
1987-06-30	223
1987-12-31	208
1988-06-30	167
1988-12-31	246
1989-06-30	285
1989-12-31	297
1990-06-30	368
1990-12-31	394
1991-06-30	248
1991-12-31	256
1992-06-30	308
1992-12-31	312
1993-06-30	365
1993-12-31	380
1994-06-30	377
1994-12-31	447
1995-06-30	441
1995-12-31	405
1996-06-30	514
1996-12-31	616
1997-06-30	807
1997-12-31	826
1998-06-30	1062
1998-12-31	822
1999-06-30	806