Bi-annual	US dollars
1987-06-30	959
1987-12-31	932
1988-06-30	1010
1988-12-31	882
1989-06-30	901
1989-12-31	1071
1990-06-30	703
1990-12-31	762
1991-06-30	616
1991-12-31	749
1992-06-30	807
1992-12-31	783
1993-06-30	966
1993-12-31	1122
1994-06-30	1242
1994-12-31	1453
1995-06-30	1583
1995-12-31	1601
1996-06-30	1105
1996-12-31	1125
1997-06-30	795
1997-12-31	737
1998-06-30	1252
1998-12-31	1689
1999-06-30	1186