Bi-annual	US dollars
1987-06-30	13
1987-12-31	36
1988-06-30	44
1988-12-31	11
1989-06-30	19
1989-12-31	26
1990-06-30	16
1990-12-31	12
1991-06-30	13
1991-12-31	19
1992-06-30	17
1992-12-31	29
1993-06-30	146
1993-12-31	25
1994-06-30	56
1994-12-31	48
1995-06-30	51
1995-12-31	64
1996-06-30	112
1996-12-31	151
1997-06-30	195
1997-12-31	161
1998-06-30	277
1998-12-31	180
1999-06-30	177