Bi-annual	US dollars
1987-06-30	1082
1987-12-31	1062
1988-06-30	841
1988-12-31	720
1989-06-30	605
1989-12-31	535
1990-06-30	460
1990-12-31	419
1991-06-30	579
1991-12-31	940
1992-06-30	1054
1992-12-31	1257
1993-06-30	1148
1993-12-31	847
1994-06-30	773
1994-12-31	620
1995-06-30	635
1995-12-31	470
1996-06-30	479
1996-12-31	1661
1997-06-30	546
1997-12-31	495
1998-06-30	1007
1998-12-31	1082
1999-06-30	1067