Bi-annual	US dollars
1987-06-30	2
1987-12-31	4
1988-06-30	7
1988-12-31	7
1989-06-30	9
1989-12-31	10
1990-06-30	10
1990-12-31	12
1991-06-30	11
1991-12-31	17
1992-06-30	19
1992-12-31	21
1993-06-30	24
1993-12-31	24
1994-06-30	29
1994-12-31	41
1995-06-30	43
1995-12-31	48
1996-06-30	50
1996-12-31	51
1997-06-30	93
1997-12-31	58
1998-06-30	77
1998-12-31	50
1999-06-30	57