Bi-annual	US dollars
1987-06-30	21
1987-12-31	21
1988-06-30	24
1988-12-31	52
1989-06-30	22
1989-12-31	19
1990-06-30	17
1990-12-31	19
1991-06-30	15
1991-12-31	13
1992-06-30	17
1992-12-31	21
1993-06-30	78
1993-12-31	96
1994-06-30	108
1994-12-31	145
1995-06-30	154
1995-12-31	157
1996-06-30	165
1996-12-31	164
1997-06-30	183
1997-12-31	128
1998-06-30	138
1998-12-31	155
1999-06-30	131