Bi-annual	US dollars
1987-06-30	148
1987-12-31	72
1988-06-30	38
1988-12-31	36
1989-06-30	34
1989-12-31	11
1990-06-30	24
1990-12-31	29
1991-06-30	49
1991-12-31	105
1992-06-30	126
1992-12-31	100
1993-06-30	96
1993-12-31	103
1994-06-30	150
1994-12-31	181
1995-06-30	180
1995-12-31	242
1996-06-30	280
1996-12-31	294
1997-06-30	354
1997-12-31	255
1998-06-30	205
1998-12-31	306
1999-06-30	265