Bi-annual	US dollars
1987-06-30	168
1987-12-31	185
1988-06-30	196
1988-12-31	134
1989-06-30	144
1989-12-31	184
1990-06-30	215
1990-12-31	226
1991-06-30	170
1991-12-31	189
1992-06-30	204
1992-12-31	162
1993-06-30	341
1993-12-31	186
1994-06-30	265
1994-12-31	488
1995-06-30	286
1995-12-31	309
1996-06-30	435
1996-12-31	320
1997-06-30	589
1997-12-31	619
1998-06-30	842
1998-12-31	682
1999-06-30	659