Bi-annual	US dollars
1987-06-30	5966
1987-12-31	8091
1988-06-30	6981
1988-12-31	6283
1989-06-30	5641
1989-12-31	5318
1990-06-30	5448
1990-12-31	6010
1991-06-30	5393
1991-12-31	5308
1992-06-30	5741
1992-12-31	5798
1993-06-30	7475
1993-12-31	7726
1994-06-30	9022
1994-12-31	8099
1995-06-30	8638
1995-12-31	7126
1996-06-30	8642
1996-12-31	8122
1997-06-30	14270
1997-12-31	8781
1998-06-30	10151
1998-12-31	8644
1999-06-30	8800