Bi-annual	US dollars
1987-06-30	564
1987-12-31	453
1988-06-30	391
1988-12-31	257
1989-06-30	191
1989-12-31	237
1990-06-30	209
1990-12-31	206
1991-06-30	195
1991-12-31	106
1992-06-30	154
1992-12-31	109
1993-06-30	477
1993-12-31	364
1994-06-30	560
1994-12-31	501
1995-06-30	557
1995-12-31	606
1996-06-30	791
1996-12-31	378
1997-06-30	273
1997-12-31	513
1998-06-30	495
1998-12-31	704
1999-06-30	1559