Bi-annual	US dollars
1987-06-30	1779
1987-12-31	2046
1988-06-30	1799
1988-12-31	2030
1989-06-30	2052
1989-12-31	1661
1990-06-30	141
1990-12-31	156
1991-06-30	186
1991-12-31	459
1992-06-30	617
1992-12-31	845
1993-06-30	1403
1993-12-31	1593
1994-06-30	1384
1994-12-31	1690
1995-06-30	1495
1995-12-31	1307
1996-06-30	1130
1996-12-31	1245
1997-06-30	1338
1997-12-31	1951
1998-06-30	1604
1998-12-31	1453
1999-06-30	1473