Bi-annual	US dollars
1987-06-30	4254
1987-12-31	3931
1988-06-30	4051
1988-12-31	4184
1989-06-30	3446
1989-12-31	3344
1990-06-30	1843
1990-12-31	693
1991-06-30	1717
1991-12-31	648
1992-06-30	540
1992-12-31	597
1993-06-30	720
1993-12-31	959
1994-06-30	798
1994-12-31	634
1995-06-30	616
1995-12-31	625
1996-06-30	601
1996-12-31	621
1997-06-30	626
1997-12-31	800
1998-06-30	820
1998-12-31	869
1999-06-30	856