Bi-annual	US dollars
1987-06-30	584
1987-12-31	426
1988-06-30	442
1988-12-31	363
1989-06-30	586
1989-12-31	347
1990-06-30	544
1990-12-31	521
1991-06-30	611
1991-12-31	796
1992-06-30	999
1992-12-31	812
1993-06-30	1547
1993-12-31	2349
1994-06-30	2224
1994-12-31	2336
1995-06-30	2846
1995-12-31	3473
1996-06-30	4082
1996-12-31	3977
1997-06-30	3796
1997-12-31	3542
1998-06-30	3943
1998-12-31	4070
1999-06-30	3646