Bi-annual	US dollars
1987-06-30	324
1987-12-31	215
1988-06-30	246
1988-12-31	190
1989-06-30	256
1989-12-31	287
1990-06-30	415
1990-12-31	519
1991-06-30	842
1991-12-31	1081
1992-06-30	1037
1992-12-31	885
1993-06-30	1127
1993-12-31	1132
1994-06-30	1569
1994-12-31	1857
1995-06-30	2186
1995-12-31	3158
1996-06-30	3229
1996-12-31	4497
1997-06-30	4646
1997-12-31	5049
1998-06-30	4390
1998-12-31	4431
1999-06-30	3748