Bi-annual	US dollars
1987-06-30	1037
1987-12-31	1357
1988-06-30	1265
1988-12-31	1253
1989-06-30	1327
1989-12-31	1521
1990-06-30	1498
1990-12-31	1324
1991-06-30	1091
1991-12-31	2512
1992-06-30	2440
1992-12-31	842
1993-06-30	738
1993-12-31	931
1994-06-30	1034
1994-12-31	1640
1995-06-30	2117
1995-12-31	1609
1996-06-30	1694
1996-12-31	1558
1997-06-30	1522
1997-12-31	1331
1998-06-30	2736
1998-12-31	1696
1999-06-30	1708