Bi-annual	US dollars
1987-06-30	922
1987-12-31	1019
1988-06-30	885
1988-12-31	780
1989-06-30	833
1989-12-31	786
1990-06-30	749
1990-12-31	666
1991-06-30	350
1991-12-31	495
1992-06-30	558
1992-12-31	542
1993-06-30	754
1993-12-31	939
1994-06-30	835
1994-12-31	1313
1995-06-30	1221
1995-12-31	1298
1996-06-30	1417
1996-12-31	1470
1997-06-30	1708
1997-12-31	1866
1998-06-30	2454
1998-12-31	2391
1999-06-30	2865