Bi-annual	US dollars
1987-06-30	1334
1987-12-31	1370
1988-06-30	1109
1988-12-31	976
1989-06-30	1152
1989-12-31	893
1990-06-30	724
1990-12-31	396
1991-06-30	345
1991-12-31	502
1992-06-30	508
1992-12-31	542
1993-06-30	605
1993-12-31	746
1994-06-30	1114
1994-12-31	1166
1995-06-30	1416
1995-12-31	1403
1996-06-30	1450
1996-12-31	2133
1997-06-30	2267
1997-12-31	1886
1998-06-30	1822
1998-12-31	1438
1999-06-30	1384