Bi-annual	US dollars
1987-06-30	114
1987-12-31	185
1988-06-30	160
1988-12-31	80
1989-06-30	284
1989-12-31	277
1990-06-30	544
1990-12-31	349
1991-06-30	271
1991-12-31	321
1992-06-30	350
1992-12-31	398
1993-06-30	467
1993-12-31	559
1994-06-30	1022
1994-12-31	732
1995-06-30	1390
1995-12-31	923
1996-06-30	1235
1996-12-31	748
1997-06-30	2465
1997-12-31	842
1998-06-30	635
1998-12-31	757
1999-06-30	746