Bi-annual	US dollars
1987-06-30	163
1987-12-31	187
1988-06-30	177
1988-12-31	184
1989-06-30	166
1989-12-31	185
1990-06-30	150
1990-12-31	199
1991-06-30	175
1991-12-31	177
1992-06-30	141
1992-12-31	108
1993-06-30	102
1993-12-31	58
1994-06-30	59
1994-12-31	25
1995-06-30	30
1995-12-31	22
1996-06-30	37
1996-12-31	48
1997-06-30	48
1997-12-31	54
1998-06-30	67
1998-12-31	50
1999-06-30	39