Bi-annual	US dollars
1987-06-30	4844
1987-12-31	5863
1988-06-30	5640
1988-12-31	5626
1989-06-30	4889
1989-12-31	4204
1990-06-30	3676
1990-12-31	3120
1991-06-30	2648
1991-12-31	2850
1992-06-30	2698
1992-12-31	2698
1993-06-30	2296
1993-12-31	1994
1994-06-30	1653
1994-12-31	1630
1995-06-30	1360
1995-12-31	1250
1996-06-30	1254
1996-12-31	1620
1997-06-30	1612
1997-12-31	997
1998-06-30	1144
1998-12-31	1132
1999-06-30	921