Bi-annual	US dollars
1987-06-30	782
1987-12-31	708
1988-06-30	742
1988-12-31	476
1989-06-30	428
1989-12-31	653
1990-06-30	516
1990-12-31	610
1991-06-30	538
1991-12-31	553
1992-06-30	824
1992-12-31	709
1993-06-30	908
1993-12-31	723
1994-06-30	1022
1994-12-31	903
1995-06-30	1443
1995-12-31	1380
1996-06-30	1332
1996-12-31	1178
1997-06-30	975
1997-12-31	1069
1998-06-30	1621
1998-12-31	1757
1999-06-30	2307