Bi-annual	US dollars
1987-06-30	671
1987-12-31	330
1988-06-30	174
1988-12-31	268
1989-06-30	169
1989-12-31	226
1990-06-30	85
1990-12-31	50
1991-06-30	118
1991-12-31	189
1992-06-30	438
1992-12-31	448
1993-06-30	795
1993-12-31	1088
1994-06-30	1228
1994-12-31	1408
1995-06-30	902
1995-12-31	750
1996-06-30	962
1996-12-31	1294
1997-06-30	1015
1997-12-31	1375
1998-06-30	1789
1998-12-31	1842
1999-06-30	2334