Bi-annual	US dollars
1987-06-30	2393
1987-12-31	2563
1988-06-30	2200
1988-12-31	2110
1989-06-30	1646
1989-12-31	1392
1990-06-30	1025
1990-12-31	664
1991-06-30	407
1991-12-31	370
1992-06-30	360
1992-12-31	245
1993-06-30	173
1993-12-31	157
1994-06-30	137
1994-12-31	130
1995-06-30	116
1995-12-31	99
1996-06-30	120
1996-12-31	128
1997-06-30	108
1997-12-31	84
1998-06-30	128
1998-12-31	116
1999-06-30	101