Bi-annual	US dollars
1987-06-30	37
1987-12-31	66
1988-06-30	72
1988-12-31	34
1989-06-30	39
1989-12-31	56
1990-06-30	37
1990-12-31	27
1991-06-30	54
1991-12-31	26
1992-06-30	30
1992-12-31	32
1993-06-30	59
1993-12-31	78
1994-06-30	173
1994-12-31	189
1995-06-30	143
1995-12-31	102
1996-06-30	143
1996-12-31	146
1997-06-30	138
1997-12-31	161
1998-06-30	250
1998-12-31	358
1999-06-30	341