Bi-annual	US dollars
1987-06-30	3062
1987-12-31	3312
1988-06-30	3384
1988-12-31	3276
1989-06-30	3220
1989-12-31	2727
1990-06-30	2351
1990-12-31	2190
1991-06-30	2114
1991-12-31	2344
1992-06-30	2084
1992-12-31	2032
1993-06-30	788
1993-12-31	806
1994-06-30	835
1994-12-31	959
1995-06-30	1032
1995-12-31	1219
1996-06-30	1150
1996-12-31	1162
1997-06-30	1584
1997-12-31	3993
1998-06-30	4757
1998-12-31	5306
1999-06-30	5574