Bi-annual	US dollars
1987-06-30	23
1987-12-31	25
1988-06-30	14
1988-12-31	9
1989-06-30	6
1989-12-31	8
1990-06-30	9
1990-12-31	14
1991-06-30	11
1991-12-31	11
1992-06-30	13
1992-12-31	9
1993-06-30	47
1993-12-31	59
1994-06-30	71
1994-12-31	94
1995-06-30	145
1995-12-31	166
1996-06-30	242
1996-12-31	301
1997-06-30	324
1997-12-31	367
1998-06-30	459
1998-12-31	474
1999-06-30	490