Bi-annual	US dollars
1987-06-30	1669
1987-12-31	634
1988-06-30	720
1988-12-31	635
1989-06-30	569
1989-12-31	766
1990-06-30	443
1990-12-31	450
1991-06-30	399
1991-12-31	512
1992-06-30	388
1992-12-31	670
1993-06-30	312
1993-12-31	795
1994-06-30	1247
1994-12-31	1212
1995-06-30	1152
1995-12-31	1222
1996-06-30	1877
1996-12-31	1827
1997-06-30	2058
1997-12-31	1790
1998-06-30	2096
1998-12-31	2310
1999-06-30	1965