Bi-annual	US dollars
1987-06-30	105
1987-12-31	96
1988-06-30	140
1988-12-31	165
1989-06-30	200
1989-12-31	164
1990-06-30	105
1990-12-31	156
1991-06-30	122
1991-12-31	120
1992-06-30	124
1992-12-31	130
1993-06-30	41
1993-12-31	38
1994-06-30	37
1994-12-31	28
1995-06-30	21
1995-12-31	33
1996-06-30	31
1996-12-31	29
1997-06-30	27
1997-12-31	26
1998-06-30	52
1998-12-31	82
1999-06-30	73