Bi-annual	US dollars
1987-06-30	223
1987-12-31	268
1988-06-30	252
1988-12-31	266
1989-06-30	223
1989-12-31	256
1990-06-30	242
1990-12-31	214
1991-06-30	143
1991-12-31	151
1992-06-30	135
1992-12-31	97
1993-06-30	47
1993-12-31	59
1994-06-30	48
1994-12-31	41
1995-06-30	27
1995-12-31	22
1996-06-30	12
1996-12-31	10
1997-06-30	10
1997-12-31	8
1998-06-30	2
1998-12-31	0
1999-06-30	0