Bi-annual	US dollars
1987-06-30	13484
1987-12-31	13852
1988-06-30	13685
1988-12-31	15997
1989-06-30	9518
1989-12-31	9807
1990-06-30	8666
1990-12-31	4785
1991-06-30	4448
1991-12-31	6476
1992-06-30	10141
1992-12-31	9410
1993-06-30	11207
1993-12-31	12368
1994-06-30	14228
1994-12-31	10456
1995-06-30	12395
1995-12-31	10983
1996-06-30	11139
1996-12-31	11544
1997-06-30	13122
1997-12-31	15453
1998-06-30	13834
1998-12-31	13705
1999-06-30	14412