Bi-annual	US dollars
1987-06-30	82
1987-12-31	89
1988-06-30	99
1988-12-31	110
1989-06-30	104
1989-12-31	116
1990-06-30	120
1990-12-31	149
1991-06-30	136
1991-12-31	185
1992-06-30	219
1992-12-31	217
1993-06-30	239
1993-12-31	214
1994-06-30	364
1994-12-31	335
1995-06-30	388
1995-12-31	354
1996-06-30	379
1996-12-31	438
1997-06-30	419
1997-12-31	517
1998-06-30	532
1998-12-31	406
1999-06-30	363