Bi-annual	US dollars
1987-06-30	568
1987-12-31	445
1988-06-30	450
1988-12-31	293
1989-06-30	341
1989-12-31	440
1990-06-30	194
1990-12-31	81
1991-06-30	159
1991-12-31	164
1992-06-30	474
1992-12-31	489
1993-06-30	854
1993-12-31	1725
1994-06-30	1957
1994-12-31	2004
1995-06-30	1586
1995-12-31	1316
1996-06-30	1695
1996-12-31	2101
1997-06-30	1938
1997-12-31	2920
1998-06-30	2646
1998-12-31	2486
1999-06-30	3217