Bi-annual	US dollars
1987-06-30	1837
1987-12-31	2321
1988-06-30	2742
1988-12-31	2855
1989-06-30	1564
1989-12-31	1048
1990-06-30	663
1990-12-31	455
1991-06-30	644
1991-12-31	435
1992-06-30	643
1992-12-31	594
1993-06-30	405
1993-12-31	748
1994-06-30	917
1994-12-31	1054
1995-06-30	926
1995-12-31	1192
1996-06-30	1091
1996-12-31	1400
1997-06-30	1657
1997-12-31	1775
1998-06-30	3203
1998-12-31	3378
1999-06-30	3209