Bi-annual	US dollars
1987-06-30	266
1987-12-31	175
1988-06-30	278
1988-12-31	262
1989-06-30	260
1989-12-31	279
1990-06-30	340
1990-12-31	318
1991-06-30	271
1991-12-31	284
1992-06-30	400
1992-12-31	332
1993-06-30	1076
1993-12-31	965
1994-06-30	1042
1994-12-31	1277
1995-06-30	1072
1995-12-31	1147
1996-06-30	1004
1996-12-31	1195
1997-06-30	1303
1997-12-31	1487
1998-06-30	1527
1998-12-31	1241
1999-06-30	1254