Bi-annual	US dollars
1987-06-30	27
1987-12-31	42
1988-06-30	85
1988-12-31	83
1989-06-30	57
1989-12-31	74
1990-06-30	73
1990-12-31	83
1991-06-30	123
1991-12-31	170
1992-06-30	228
1992-12-31	265
1993-06-30	549
1993-12-31	517
1994-06-30	844
1994-12-31	1022
1995-06-30	1176
1995-12-31	1239
1996-06-30	1621
1996-12-31	1938
1997-06-30	1941
1997-12-31	2805
1998-06-30	2671
1998-12-31	2666
1999-06-30	2793