Bi-annual	US dollars
1987-06-30	445
1987-12-31	755
1988-06-30	529
1988-12-31	383
1989-06-30	467
1989-12-31	337
1990-06-30	534
1990-12-31	396
1991-06-30	392
1991-12-31	443
1992-06-30	658
1992-12-31	533
1993-06-30	1001
1993-12-31	625
1994-06-30	1191
1994-12-31	1164
1995-06-30	1670
1995-12-31	1768
1996-06-30	2635
1996-12-31	2226
1997-06-30	3793
1997-12-31	3495
1998-06-30	3296
1998-12-31	3925
1999-06-30	5315