Bi-annual	US dollars
1987-06-30	456
1987-12-31	738
1988-06-30	1465
1988-12-31	1976
1989-06-30	1614
1989-12-31	1851
1990-06-30	909
1990-12-31	797
1991-06-30	618
1991-12-31	1451
1992-06-30	1631
1992-12-31	1407
1993-06-30	1549
1993-12-31	930
1994-06-30	853
1994-12-31	1051
1995-06-30	902
1995-12-31	719
1996-06-30	648
1996-12-31	680
1997-06-30	507
1997-12-31	706
1998-06-30	799
1998-12-31	919
1999-06-30	1397