Bi-annual	US dollars
1987-06-30	580
1987-12-31	706
1988-06-30	612
1988-12-31	474
1989-06-30	581
1989-12-31	521
1990-06-30	605
1990-12-31	595
1991-06-30	475
1991-12-31	374
1992-06-30	377
1992-12-31	311
1993-06-30	301
1993-12-31	242
1994-06-30	142
1994-12-31	322
1995-06-30	153
1995-12-31	206
1996-06-30	668
1996-12-31	313
1997-06-30	1080
1997-12-31	971
1998-06-30	965
1998-12-31	1301
1999-06-30	1665