Bi-annual	US dollars
1987-06-30	3193
1987-12-31	2610
1988-06-30	3663
1988-12-31	3922
1989-06-30	4060
1989-12-31	3636
1990-06-30	3755
1990-12-31	3834
1991-06-30	3321
1991-12-31	3515
1992-06-30	3515
1992-12-31	2625
1993-06-30	2966
1993-12-31	2134
1994-06-30	2339
1994-12-31	2482
1995-06-30	3472
1995-12-31	4147
1996-06-30	3847
1996-12-31	5919
1997-06-30	5714
1997-12-31	5614
1998-06-30	7371
1998-12-31	5816
1999-06-30	7299