Bi-annual	US dollars
1987-06-30	242
1987-12-31	238
1988-06-30	423
1988-12-31	362
1989-06-30	415
1989-12-31	284
1990-06-30	190
1990-12-31	257
1991-06-30	230
1991-12-31	245
1992-06-30	238
1992-12-31	1444
1993-06-30	2116
1993-12-31	2579
1994-06-30	1434
1994-12-31	2284
1995-06-30	2235
1995-12-31	2819
1996-06-30	3665
1996-12-31	5162
1997-06-30	5380
1997-12-31	5388
1998-06-30	6723
1998-12-31	6307
1999-06-30	5159