Bi-annual	US dollars
1987-06-30	789
1987-12-31	617
1988-06-30	810
1988-12-31	640
1989-06-30	1014
1989-12-31	947
1990-06-30	996
1990-12-31	1480
1991-06-30	1649
1991-12-31	1674
1992-06-30	1481
1992-12-31	1153
1993-06-30	1092
1993-12-31	1252
1994-06-30	940
1994-12-31	1392
1995-06-30	1783
1995-12-31	2031
1996-06-30	2068
1996-12-31	2556
1997-06-30	2589
1997-12-31	3677
1998-06-30	3826
1998-12-31	4438
1999-06-30	4880