Bi-annual	US dollars
1987-06-30	529
1987-12-31	540
1988-06-30	498
1988-12-31	524
1989-06-30	450
1989-12-31	340
1990-06-30	209
1990-12-31	270
1991-06-30	237
1991-12-31	202
1992-06-30	204
1992-12-31	186
1993-06-30	270
1993-12-31	275
1994-06-30	301
1994-12-31	255
1995-06-30	237
1995-12-31	91
1996-06-30	118
1996-12-31	104
1997-06-30	91
1997-12-31	64
1998-06-30	60
1998-12-31	58
1999-06-30	54