Bi-annual	US dollars
1987-06-30	40
1987-12-31	42
1988-06-30	22
1988-12-31	24
1989-06-30	53
1989-12-31	29
1990-06-30	17
1990-12-31	14
1991-06-30	18
1991-12-31	24
1992-06-30	89
1992-12-31	106
1993-06-30	144
1993-12-31	137
1994-06-30	157
1994-12-31	152
1995-06-30	97
1995-12-31	98
1996-06-30	93
1996-12-31	99
1997-06-30	100
1997-12-31	130
1998-06-30	205
1998-12-31	138
1999-06-30	210