Bi-annual	US dollars
1987-06-30	27
1987-12-31	30
1988-06-30	23
1988-12-31	29
1989-06-30	22
1989-12-31	29
1990-06-30	33
1990-12-31	38
1991-06-30	37
1991-12-31	123
1992-06-30	179
1992-12-31	163
1993-06-30	157
1993-12-31	128
1994-06-30	116
1994-12-31	108
1995-06-30	154
1995-12-31	113
1996-06-30	211
1996-12-31	88
1997-06-30	136
1997-12-31	186
1998-06-30	163
1998-12-31	233
1999-06-30	303