Bi-annual	US dollars
1987-06-30	277
1987-12-31	308
1988-06-30	276
1988-12-31	282
1989-06-30	267
1989-12-31	255
1990-06-30	255
1990-12-31	228
1991-06-30	170
1991-12-31	177
1992-06-30	194
1992-12-31	198
1993-06-30	204
1993-12-31	204
1994-06-30	216
1994-12-31	246
1995-06-30	269
1995-12-31	267
1996-06-30	275
1996-12-31	306
1997-06-30	343
1997-12-31	242
1998-06-30	303
1998-12-31	273
1999-06-30	243