Bi-annual	US dollars
1987-06-30	5908
1987-12-31	6867
1988-06-30	6556
1988-12-31	8056
1989-06-30	7170
1989-12-31	7137
1990-06-30	6444
1990-12-31	5806
1991-06-30	5985
1991-12-31	6920
1992-06-30	6782
1992-12-31	6165
1993-06-30	8508
1993-12-31	8695
1994-06-30	9321
1994-12-31	7799
1995-06-30	8105
1995-12-31	10424
1996-06-30	10097
1996-12-31	11943
1997-06-30	14345
1997-12-31	11905
1998-06-30	10831
1998-12-31	13157
1999-06-30	12649