Bi-annual	US dollars
1987-06-30	144
1987-12-31	145
1988-06-30	133
1988-12-31	141
1989-06-30	126
1989-12-31	114
1990-06-30	227
1990-12-31	118
1991-06-30	99
1991-12-31	131
1992-06-30	160
1992-12-31	218
1993-06-30	279
1993-12-31	253
1994-06-30	157
1994-12-31	224
1995-06-30	258
1995-12-31	324
1996-06-30	286
1996-12-31	219
1997-06-30	233
1997-12-31	967
1998-06-30	1692
1998-12-31	361
1999-06-30	632