Bi-annual	US dollars
1987-06-30	576
1987-12-31	691
1988-06-30	677
1988-12-31	586
1989-06-30	498
1989-12-31	610
1990-06-30	699
1990-12-31	760
1991-06-30	700
1991-12-31	764
1992-06-30	925
1992-12-31	920
1993-06-30	902
1993-12-31	749
1994-06-30	684
1994-12-31	932
1995-06-30	1650
1995-12-31	1456
1996-06-30	1639
1996-12-31	1554
1997-06-30	1248
1997-12-31	1756
1998-06-30	2011
1998-12-31	1631
1999-06-30	2083