Bi-annual	US dollars
1987-06-30	466
1987-12-31	294
1988-06-30	258
1988-12-31	230
1989-06-30	248
1989-12-31	190
1990-06-30	38
1990-12-31	98
1991-06-30	62
1991-12-31	123
1992-06-30	194
1992-12-31	168
1993-06-30	138
1993-12-31	186
1994-06-30	154
1994-12-31	152
1995-06-30	185
1995-12-31	133
1996-06-30	141
1996-12-31	92
1997-06-30	186
1997-12-31	120
1998-06-30	148
1998-12-31	170
1999-06-30	210