Bi-annual	US dollars
1987-06-30	901
1987-12-31	996
1988-06-30	921
1988-12-31	888
1989-06-30	868
1989-12-31	840
1990-06-30	794
1990-12-31	880
1991-06-30	975
1991-12-31	876
1992-06-30	946
1992-12-31	859
1993-06-30	1172
1993-12-31	1125
1994-06-30	1293
1994-12-31	1336
1995-06-30	1322
1995-12-31	1175
1996-06-30	1187
1996-12-31	1257
1997-06-30	1377
1997-12-31	1272
1998-06-30	1332
1998-12-31	1366
1999-06-30	1284