Bi-annual	US dollars
1987-06-30	390
1987-12-31	313
1988-06-30	256
1988-12-31	307
1989-06-30	195
1989-12-31	237
1990-06-30	180
1990-12-31	235
1991-06-30	305
1991-12-31	215
1992-06-30	483
1992-12-31	536
1993-06-30	846
1993-12-31	1212
1994-06-30	1028
1994-12-31	931
1995-06-30	1136
1995-12-31	1265
1996-06-30	1544
1996-12-31	1630
1997-06-30	1970
1997-12-31	2483
1998-06-30	2137
1998-12-31	2045
1999-06-30	1848