Bi-annual	US dollars
1987-06-30	564
1987-12-31	340
1988-06-30	230
1988-12-31	202
1989-06-30	136
1989-12-31	135
1990-06-30	51
1990-12-31	189
1991-06-30	91
1991-12-31	211
1992-06-30	169
1992-12-31	168
1993-06-30	243
1993-12-31	231
1994-06-30	259
1994-12-31	257
1995-06-30	245
1995-12-31	267
1996-06-30	337
1996-12-31	351
1997-06-30	482
1997-12-31	643
1998-06-30	560
1998-12-31	629
1999-06-30	762