Bi-annual	US dollars
1987-06-30	297
1987-12-31	253
1988-06-30	147
1988-12-31	239
1989-06-30	214
1989-12-31	127
1990-06-30	164
1990-12-31	69
1991-06-30	71
1991-12-31	189
1992-06-30	491
1992-12-31	359
1993-06-30	591
1993-12-31	356
1994-06-30	437
1994-12-31	480
1995-06-30	531
1995-12-31	490
1996-06-30	682
1996-12-31	377
1997-06-30	414
1997-12-31	457
1998-06-30	577
1998-12-31	354
1999-06-30	429