Bi-annual	US dollars
1987-06-30	300
1987-12-31	291
1988-06-30	244
1988-12-31	136
1989-06-30	122
1989-12-31	74
1990-06-30	157
1990-12-31	158
1991-06-30	136
1991-12-31	134
1992-06-30	147
1992-12-31	126
1993-06-30	156
1993-12-31	396
1994-06-30	446
1994-12-31	242
1995-06-30	277
1995-12-31	354
1996-06-30	486
1996-12-31	669
1997-06-30	715
1997-12-31	711
1998-06-30	922
1998-12-31	1007
1999-06-30	1045