Bi-annual	US dollars
1987-06-30	1092
1987-12-31	1034
1988-06-30	752
1988-12-31	495
1989-06-30	736
1989-12-31	497
1990-06-30	664
1990-12-31	571
1991-06-30	506
1991-12-31	586
1992-06-30	710
1992-12-31	529
1993-06-30	1232
1993-12-31	1230
1994-06-30	1323
1994-12-31	1608
1995-06-30	1373
1995-12-31	1777
1996-06-30	1274
1996-12-31	1676
1997-06-30	2745
1997-12-31	2076
1998-06-30	1892
1998-12-31	2288
1999-06-30	2116