Bi-annual	US dollars
1987-06-30	252
1987-12-31	308
1988-06-30	300
1988-12-31	363
1989-06-30	339
1989-12-31	308
1990-06-30	269
1990-12-31	287
1991-06-30	276
1991-12-31	265
1992-06-30	238
1992-12-31	244
1993-06-30	369
1993-12-31	333
1994-06-30	355
1994-12-31	355
1995-06-30	465
1995-12-31	516
1996-06-30	527
1996-12-31	483
1997-06-30	469
1997-12-31	487
1998-06-30	383
1998-12-31	356
1999-06-30	345