Bi-annual	US dollars
1987-06-30	516
1987-12-31	832
1988-06-30	798
1988-12-31	853
1989-06-30	665
1989-12-31	821
1990-06-30	694
1990-12-31	621
1991-06-30	853
1991-12-31	994
1992-06-30	632
1992-12-31	771
1993-06-30	1226
1993-12-31	1111
1994-06-30	1224
1994-12-31	1378
1995-06-30	1524
1995-12-31	1470
1996-06-30	1401
1996-12-31	1724
1997-06-30	2381
1997-12-31	2521
1998-06-30	2107
1998-12-31	3401
1999-06-30	3103