Bi-annual	US dollars
1987-06-30	90
1987-12-31	30
1988-06-30	60
1988-12-31	20
1989-06-30	91
1989-12-31	44
1990-06-30	63
1990-12-31	156
1991-06-30	167
1991-12-31	138
1992-06-30	103
1992-12-31	285
1993-06-30	383
1993-12-31	334
1994-06-30	511
1994-12-31	533
1995-06-30	803
1995-12-31	1017
1996-06-30	1552
1996-12-31	2092
1997-06-30	1822
1997-12-31	1423
1998-06-30	1644
1998-12-31	1594
1999-06-30	1898