Bi-annual	US dollars
1987-06-30	527
1987-12-31	434
1988-06-30	438
1988-12-31	457
1989-06-30	491
1989-12-31	429
1990-06-30	584
1990-12-31	753
1991-06-30	931
1991-12-31	1085
1992-06-30	1142
1992-12-31	1129
1993-06-30	1358
1993-12-31	1284
1994-06-30	1588
1994-12-31	1809
1995-06-30	2289
1995-12-31	3089
1996-06-30	3053
1996-12-31	3710
1997-06-30	3966
1997-12-31	4358
1998-06-30	1591
1998-12-31	1389
1999-06-30	736