Bi-annual	US dollars
1987-06-30	679
1987-12-31	676
1988-06-30	773
1988-12-31	1197
1989-06-30	457
1989-12-31	306
1990-06-30	384
1990-12-31	309
1991-06-30	261
1991-12-31	487
1992-06-30	877
1992-12-31	673
1993-06-30	744
1993-12-31	692
1994-06-30	702
1994-12-31	360
1995-06-30	360
1995-12-31	313
1996-06-30	329
1996-12-31	373
1997-06-30	444
1997-12-31	370
1998-06-30	287
1998-12-31	271
1999-06-30	531