Bi-annual	US dollars
1987-06-30	690
1987-12-31	1279
1988-06-30	1124
1988-12-31	1090
1989-06-30	836
1989-12-31	1166
1990-06-30	834
1990-12-31	708
1991-06-30	464
1991-12-31	926
1992-06-30	470
1992-12-31	550
1993-06-30	1493
1993-12-31	1182
1994-06-30	1123
1994-12-31	2516
1995-06-30	1122
1995-12-31	2062
1996-06-30	1594
1996-12-31	1731
1997-06-30	1577
1997-12-31	1287
1998-06-30	2344
1998-12-31	740
1999-06-30	1069