Bi-annual	US dollars
1987-06-30	18
1987-12-31	13
1988-06-30	22
1988-12-31	58
1989-06-30	36
1989-12-31	29
1990-06-30	14
1990-12-31	10
1991-06-30	24
1991-12-31	47
1992-06-30	59
1992-12-31	41
1993-06-30	191
1993-12-31	168
1994-06-30	181
1994-12-31	180
1995-06-30	215
1995-12-31	147
1996-06-30	109
1996-12-31	116
1997-06-30	108
1997-12-31	143
1998-06-30	305
1998-12-31	378
1999-06-30	416