Bi-annual	US dollars
1987-06-30	1113
1987-12-31	351
1988-06-30	426
1988-12-31	354
1989-06-30	403
1989-12-31	440
1990-06-30	671
1990-12-31	698
1991-06-30	590
1991-12-31	1132
1992-06-30	839
1992-12-31	811
1993-06-30	1155
1993-12-31	1994
1994-06-30	1159
1994-12-31	831
1995-06-30	766
1995-12-31	1222
1996-06-30	1219
1996-12-31	1500
1997-06-30	1838
1997-12-31	2475
1998-06-30	2099
1998-12-31	2060
1999-06-30	2277