Bi-annual	US dollars
1987-06-30	261
1987-12-31	332
1988-06-30	418
1988-12-31	231
1989-06-30	490
1989-12-31	468
1990-06-30	767
1990-12-31	546
1991-06-30	512
1991-12-31	540
1992-06-30	725
1992-12-31	497
1993-06-30	506
1993-12-31	377
1994-06-30	549
1994-12-31	627
1995-06-30	698
1995-12-31	656
1996-06-30	987
1996-12-31	596
1997-06-30	719
1997-12-31	847
1998-06-30	922
1998-12-31	724
1999-06-30	618