Bi-annual	US dollars
1987-06-30	52
1987-12-31	66
1988-06-30	84
1988-12-31	119
1989-06-30	153
1989-12-31	60
1990-06-30	84
1990-12-31	122
1991-06-30	94
1991-12-31	129
1992-06-30	143
1992-12-31	89
1993-06-30	140
1993-12-31	189
1994-06-30	177
1994-12-31	181
1995-06-30	157
1995-12-31	160
1996-06-30	110
1996-12-31	77
1997-06-30	336
1997-12-31	341
1998-06-30	340
1998-12-31	100
1999-06-30	284