Bi-annual	US dollars
1987-06-30	6392
1987-12-31	7335
1988-06-30	7156
1988-12-31	9226
1989-06-30	8664
1989-12-31	10517
1990-06-30	11284
1990-12-31	12648
1991-06-30	10070
1991-12-31	11797
1992-06-30	11355
1992-12-31	6775
1993-06-30	7259
1993-12-31	8080
1994-06-30	9853
1994-12-31	11591
1995-06-30	11131
1995-12-31	10223
1996-06-30	10133
1996-12-31	9755
1997-06-30	10145
1997-12-31	10443
1998-06-30	13138
1998-12-31	12086
1999-06-30	12170