Bi-annual	US dollars
1987-06-30	29
1987-12-31	32
1988-06-30	22
1988-12-31	36
1989-06-30	50
1989-12-31	118
1990-06-30	82
1990-12-31	85
1991-06-30	149
1991-12-31	172
1992-06-30	160
1992-12-31	136
1993-06-30	69
1993-12-31	117
1994-06-30	151
1994-12-31	133
1995-06-30	191
1995-12-31	217
1996-06-30	242
1996-12-31	180
1997-06-30	180
1997-12-31	135
1998-06-30	62
1998-12-31	106
1999-06-30	85