Bi-annual	US dollars
1987-06-30	281
1987-12-31	325
1988-06-30	367
1988-12-31	515
1989-06-30	527
1989-12-31	398
1990-06-30	427
1990-12-31	421
1991-06-30	383
1991-12-31	458
1992-06-30	525
1992-12-31	426
1993-06-30	683
1993-12-31	715
1994-06-30	747
1994-12-31	823
1995-06-30	899
1995-12-31	954
1996-06-30	994
1996-12-31	1162
1997-06-30	1066
1997-12-31	1035
1998-06-30	1070
1998-12-31	1108
1999-06-30	1187