Bi-annual	US dollars
1987-06-30	493
1987-12-31	464
1988-06-30	426
1988-12-31	425
1989-06-30	307
1989-12-31	308
1990-06-30	267
1990-12-31	266
1991-06-30	203
1991-12-31	312
1992-06-30	240
1992-12-31	208
1993-06-30	381
1993-12-31	469
1994-06-30	404
1994-12-31	565
1995-06-30	487
1995-12-31	975
1996-06-30	580
1996-12-31	620
1997-06-30	878
1997-12-31	961
1998-06-30	428
1998-12-31	185
1999-06-30	213