Bi-annual	US dollars
1987-06-30	223
1987-12-31	194
1988-06-30	252
1988-12-31	421
1989-06-30	60
1989-12-31	279
1990-06-30	417
1990-12-31	181
1991-06-30	174
1991-12-31	181
1992-06-30	131
1992-12-31	192
1993-06-30	227
1993-12-31	146
1994-06-30	407
1994-12-31	277
1995-06-30	121
1995-12-31	206
1996-06-30	163
1996-12-31	289
1997-06-30	349
1997-12-31	625
1998-06-30	240
1998-12-31	414
1999-06-30	155