Bi-annual	US dollars
1987-06-30	806
1987-12-31	1017
1988-06-30	730
1988-12-31	707
1989-06-30	842
1989-12-31	772
1990-06-30	860
1990-12-31	673
1991-06-30	778
1991-12-31	728
1992-06-30	1277
1992-12-31	1323
1993-06-30	1484
1993-12-31	1571
1994-06-30	1613
1994-12-31	1619
1995-06-30	1198
1995-12-31	940
1996-06-30	915
1996-12-31	1162
1997-06-30	1284
1997-12-31	1430
1998-06-30	1852
1998-12-31	1702
1999-06-30	2078