Bi-annual	US dollars
1987-06-30	539
1987-12-31	596
1988-06-30	604
1988-12-31	620
1989-06-30	614
1989-12-31	540
1990-06-30	485
1990-12-31	426
1991-06-30	426
1991-12-31	407
1992-06-30	394
1992-12-31	344
1993-06-30	309
1993-12-31	322
1994-06-30	301
1994-12-31	316
1995-06-30	116
1995-12-31	237
1996-06-30	228
1996-12-31	229
1997-06-30	266
1997-12-31	267
1998-06-30	297
1998-12-31	326
1999-06-30	289