Bi-annual	US dollars
1987-06-30	792
1987-12-31	632
1988-06-30	585
1988-12-31	662
1989-06-30	660
1989-12-31	556
1990-06-30	518
1990-12-31	602
1991-06-30	598
1991-12-31	742
1992-06-30	807
1992-12-31	747
1993-06-30	1293
1993-12-31	1370
1994-06-30	1370
1994-12-31	1422
1995-06-30	2203
1995-12-31	2296
1996-06-30	2450
1996-12-31	2943
1997-06-30	3593
1997-12-31	3523
1998-06-30	3019
1998-12-31	2749
1999-06-30	2867