Bi-annual	US dollars
1987-06-30	264
1987-12-31	289
1988-06-30	252
1988-12-31	145
1989-06-30	140
1989-12-31	100
1990-06-30	103
1990-12-31	114
1991-06-30	81
1991-12-31	99
1992-06-30	116
1992-12-31	141
1993-06-30	249
1993-12-31	207
1994-06-30	142
1994-12-31	124
1995-06-30	102
1995-12-31	91
1996-06-30	123
1996-12-31	466
1997-06-30	323
1997-12-31	400
1998-06-30	415
1998-12-31	403
1999-06-30	383