Bi-annual	US dollars
1987-06-30	23
1987-12-31	38
1988-06-30	29
1988-12-31	18
1989-06-30	33
1989-12-31	18
1990-06-30	12
1990-12-31	21
1991-06-30	24
1991-12-31	17
1992-06-30	53
1992-12-31	41
1993-06-30	86
1993-12-31	43
1994-06-30	51
1994-12-31	41
1995-06-30	48
1995-12-31	39
1996-06-30	44
1996-12-31	53
1997-06-30	37
1997-12-31	10
1998-06-30	17
1998-12-31	13
1999-06-30	8