Bi-annual	US dollars
1987-06-30	152
1987-12-31	115
1988-06-30	220
1988-12-31	188
1989-06-30	181
1989-12-31	189
1990-06-30	227
1990-12-31	347
1991-06-30	182
1991-12-31	286
1992-06-30	658
1992-12-31	253
1993-06-30	896
1993-12-31	970
1994-06-30	949
1994-12-31	1128
1995-06-30	1087
1995-12-31	1464
1996-06-30	1955
1996-12-31	2357
1997-06-30	2886
1997-12-31	3514
1998-06-30	3905
1998-12-31	2852
1999-06-30	2711