Bi-annual	US dollars
1987-06-30	8166
1987-12-31	13094
1988-06-30	10888
1988-12-31	15674
1989-06-30	9259
1989-12-31	10805
1990-06-30	11418
1990-12-31	14282
1991-06-30	10233
1991-12-31	13159
1992-06-30	7757
1992-12-31	6927
1993-06-30	8592
1993-12-31	7316
1994-06-30	7986
1994-12-31	7976
1995-06-30	8655
1995-12-31	9587
1996-06-30	10764
1996-12-31	14450
1997-06-30	12316
1997-12-31	14520
1998-06-30	13839
1998-12-31	13084
1999-06-30	13195