Bi-annual	US dollars
1987-06-30	163
1987-12-31	257
1988-06-30	346
1988-12-31	313
1989-06-30	215
1989-12-31	574
1990-06-30	309
1990-12-31	430
1991-06-30	576
1991-12-31	678
1992-06-30	620
1992-12-31	400
1993-06-30	482
1993-12-31	545
1994-06-30	600
1994-12-31	501
1995-06-30	555
1995-12-31	512
1996-06-30	395
1996-12-31	544
1997-06-30	572
1997-12-31	515
1998-06-30	617
1998-12-31	619
1999-06-30	900