Bi-annual	US dollars
1987-06-30	260
1987-12-31	192
1988-06-30	157
1988-12-31	114
1989-06-30	234
1989-12-31	71
1990-06-30	98
1990-12-31	143
1991-06-30	263
1991-12-31	235
1992-06-30	276
1992-12-31	370
1993-06-30	623
1993-12-31	643
1994-06-30	813
1994-12-31	490
1995-06-30	585
1995-12-31	657
1996-06-30	699
1996-12-31	800
1997-06-30	1359
1997-12-31	903
1998-06-30	600
1998-12-31	730
1999-06-30	538