Bi-annual	US dollars
1987-06-30	5536
1987-12-31	6267
1988-06-30	6232
1988-12-31	6939
1989-06-30	6438
1989-12-31	9011
1990-06-30	8369
1990-12-31	9071
1991-06-30	7465
1991-12-31	8213
1992-06-30	7347
1992-12-31	7872
1993-06-30	11689
1993-12-31	12903
1994-06-30	12565
1994-12-31	14802
1995-06-30	14904
1995-12-31	12244
1996-06-30	13783
1996-12-31	12177
1997-06-30	1319
1997-12-31	13177
1998-06-30	13902
1998-12-31	16221
1999-06-30	15356