Bi-annual	US dollars
1987-06-30	53
1987-12-31	49
1988-06-30	58
1988-12-31	67
1989-06-30	73
1989-12-31	35
1990-06-30	9
1990-12-31	6
1991-06-30	3
1991-12-31	4
1992-06-30	17
1992-12-31	11
1993-06-30	24
1993-12-31	33
1994-06-30	23
1994-12-31	30
1995-06-30	57
1995-12-31	85
1996-06-30	101
1996-12-31	135
1997-06-30	150
1997-12-31	174
1998-06-30	170
1998-12-31	171
1999-06-30	114