Bi-annual	US dollars
1987-06-30	693
1987-12-31	734
1988-06-30	1057
1988-12-31	584
1989-06-30	946
1989-12-31	763
1990-06-30	1083
1990-12-31	1179
1991-06-30	1013
1991-12-31	1065
1992-06-30	1214
1992-12-31	632
1993-06-30	516
1993-12-31	406
1994-06-30	546
1994-12-31	545
1995-06-30	431
1995-12-31	247
1996-06-30	314
1996-12-31	238
1997-06-30	205
1997-12-31	448
1998-06-30	417
1998-12-31	569
1999-06-30	380