Bi-annual	US dollars
1987-06-30	81
1987-12-31	102
1988-06-30	65
1988-12-31	58
1989-06-30	67
1989-12-31	61
1990-06-30	99
1990-12-31	106
1991-06-30	68
1991-12-31	99
1992-06-30	97
1992-12-31	138
1993-06-30	168
1993-12-31	390
1994-06-30	198
1994-12-31	110
1995-06-30	132
1995-12-31	253
1996-06-30	298
1996-12-31	363
1997-06-30	436
1997-12-31	573
1998-06-30	642
1998-12-31	1361
1999-06-30	710