Bi-annual	US dollars
1987-06-30	460
1987-12-31	455
1988-06-30	404
1988-12-31	345
1989-06-30	329
1989-12-31	339
1990-06-30	364
1990-12-31	363
1991-06-30	360
1991-12-31	340
1992-06-30	362
1992-12-31	417
1993-06-30	441
1993-12-31	810
1994-06-30	495
1994-12-31	380
1995-06-30	331
1995-12-31	544
1996-06-30	634
1996-12-31	757
1997-06-30	973
1997-12-31	1280
1998-06-30	1501
1998-12-31	1619
1999-06-30	1585