Bi-annual	US dollars
1987-06-30	453
1987-12-31	630
1988-06-30	756
1988-12-31	541
1989-06-30	440
1989-12-31	506
1990-06-30	945
1990-12-31	621
1991-06-30	616
1991-12-31	607
1992-06-30	624
1992-12-31	635
1993-06-30	1101
1993-12-31	1140
1994-06-30	1728
1994-12-31	1973
1995-06-30	1718
1995-12-31	1871
1996-06-30	1891
1996-12-31	1991
1997-06-30	1946
1997-12-31	2188
1998-06-30	2706
1998-12-31	2671
1999-06-30	2548