Bi-annual	US dollars
1987-06-30	73
1987-12-31	87
1988-06-30	114
1988-12-31	262
1989-06-30	316
1989-12-31	271
1990-06-30	241
1990-12-31	262
1991-06-30	219
1991-12-31	301
1992-06-30	333
1992-12-31	291
1993-06-30	357
1993-12-31	384
1994-06-30	502
1994-12-31	818
1995-06-30	875
1995-12-31	1008
1996-06-30	1280
1996-12-31	2066
1997-06-30	2216
1997-12-31	2325
1998-06-30	2524
1998-12-31	2731
1999-06-30	2821