Bi-annual	US dollars
1987-06-30	426
1987-12-31	566
1988-06-30	379
1988-12-31	781
1989-06-30	456
1989-12-31	258
1990-06-30	197
1990-12-31	106
1991-06-30	141
1991-12-31	228
1992-06-30	86
1992-12-31	130
1993-06-30	149
1993-12-31	229
1994-06-30	116
1994-12-31	72
1995-06-30	70
1995-12-31	56
1996-06-30	121
1996-12-31	325
1997-06-30	381
1997-12-31	359
1998-06-30	140
1998-12-31	128
1999-06-30	91