Bi-annual	US dollars
1987-06-30	590
1987-12-31	668
1988-06-30	384
1988-12-31	604
1989-06-30	550
1989-12-31	518
1990-06-30	438
1990-12-31	399
1991-06-30	480
1991-12-31	672
1992-06-30	809
1992-12-31	704
1993-06-30	680
1993-12-31	563
1994-06-30	713
1994-12-31	879
1995-06-30	849
1995-12-31	802
1996-06-30	831
1996-12-31	746
1997-06-30	800
1997-12-31	921
1998-06-30	1192
1998-12-31	1696
1999-06-30	1623