Bi-annual	US dollars
1987-06-30	15
1987-12-31	49
1988-06-30	55
1988-12-31	61
1989-06-30	51
1989-12-31	44
1990-06-30	10
1990-12-31	14
1991-06-30	19
1991-12-31	41
1992-06-30	44
1992-12-31	39
1993-06-30	42
1993-12-31	52
1994-06-30	68
1994-12-31	95
1995-06-30	111
1995-12-31	175
1996-06-30	211
1996-12-31	243
1997-06-30	196
1997-12-31	171
1998-06-30	183
1998-12-31	181
1999-06-30	150