Bi-annual	US dollars
1987-06-30	608
1987-12-31	643
1988-06-30	834
1988-12-31	848
1989-06-30	936
1989-12-31	1158
1990-06-30	1073
1990-12-31	1050
1991-06-30	971
1991-12-31	1106
1992-06-30	1227
1992-12-31	1098
1993-06-30	1394
1993-12-31	1454
1994-06-30	1897
1994-12-31	1705
1995-06-30	2230
1995-12-31	2234
1996-06-30	1892
1996-12-31	3177
1997-06-30	2916
1997-12-31	3409
1998-06-30	3900
1998-12-31	3907
1999-06-30	3606