Bi-annual	US dollars
1987-06-30	11807
1987-12-31	12430
1988-06-30	12981
1988-12-31	13153
1989-06-30	13096
1989-12-31	10354
1990-06-30	10124
1990-12-31	11043
1991-06-30	10206
1991-12-31	9806
1992-06-30	9515
1992-12-31	8428
1993-06-30	8283
1993-12-31	8290
1994-06-30	8608
1994-12-31	8257
1995-06-30	8228
1995-12-31	7993
1996-06-30	7169
1996-12-31	7160
1997-06-30	7366
1997-12-31	7305
1998-06-30	8165
1998-12-31	8365
1999-06-30	7275