Bi-annual	US dollars
1987-06-30	3049
1987-12-31	4778
1988-06-30	3851
1988-12-31	3124
1989-06-30	3396
1989-12-31	2770
1990-06-30	3017
1990-12-31	3159
1991-06-30	2552
1991-12-31	2393
1992-06-30	2221
1992-12-31	2419
1993-06-30	3543
1993-12-31	3800
1994-06-30	3728
1994-12-31	3337
1995-06-30	3105
1995-12-31	2392
1996-06-30	3665
1996-12-31	2907
1997-06-30	5250
1997-12-31	3062
1998-06-30	3136
1998-12-31	1617
1999-06-30	664