Bi-annual	US dollars
1987-06-30	16
1987-12-31	32
1988-06-30	46
1988-12-31	43
1989-06-30	60
1989-12-31	69
1990-06-30	54
1990-12-31	46
1991-06-30	47
1991-12-31	47
1992-06-30	51
1992-12-31	68
1993-06-30	81
1993-12-31	151
1994-06-30	151
1994-12-31	167
1995-06-30	186
1995-12-31	161
1996-06-30	196
1996-12-31	243
1997-06-30	246
1997-12-31	275
1998-06-30	372
1998-12-31	369
1999-06-30	442