Bi-annual	US dollars
1987-06-30	142
1987-12-31	174
1988-06-30	275
1988-12-31	721
1989-06-30	544
1989-12-31	758
1990-06-30	302
1990-12-31	401
1991-06-30	426
1991-12-31	441
1992-06-30	312
1992-12-31	303
1993-06-30	254
1993-12-31	278
1994-06-30	315
1994-12-31	152
1995-06-30	105
1995-12-31	122
1996-06-30	155
1996-12-31	111
1997-06-30	78
1997-12-31	63
1998-06-30	47
1998-12-31	42
1999-06-30	52