Bi-annual	US dollars
1987-06-30	1432
1987-12-31	1272
1988-06-30	2036
1988-12-31	2200
1989-06-30	1119
1989-12-31	1621
1990-06-30	912
1990-12-31	1038
1991-06-30	1000
1991-12-31	445
1992-06-30	645
1992-12-31	636
1993-06-30	807
1993-12-31	1004
1994-06-30	1535
1994-12-31	645
1995-06-30	978
1995-12-31	1090
1996-06-30	1067
1996-12-31	979
1997-06-30	923
1997-12-31	576
1998-06-30	1219
1998-12-31	1213
1999-06-30	413