Bi-annual	US dollars
1987-06-30	232
1987-12-31	196
1988-06-30	181
1988-12-31	172
1989-06-30	180
1989-12-31	139
1990-06-30	164
1990-12-31	154
1991-06-30	128
1991-12-31	112
1992-06-30	107
1992-12-31	52
1993-06-30	86
1993-12-31	412
1994-06-30	451
1994-12-31	601
1995-06-30	625
1995-12-31	682
1996-06-30	590
1996-12-31	837
1997-06-30	950
1997-12-31	949
1998-06-30	1292
1998-12-31	1156
1999-06-30	1164