Bi-annual	US dollars
1987-06-30	2072
1987-12-31	2153
1988-06-30	2250
1988-12-31	2609
1989-06-30	2141
1989-12-31	1929
1990-06-30	1486
1990-12-31	546
1991-06-30	739
1991-12-31	684
1992-06-30	1054
1992-12-31	903
1993-06-30	2249
1993-12-31	1604
1994-06-30	1424
1994-12-31	911
1995-06-30	849
1995-12-31	1068
1996-06-30	1599
1996-12-31	3778
1997-06-30	1827
1997-12-31	1593
1998-06-30	1000
1998-12-31	1176
1999-06-30	997