Bi-annual	US dollars
1987-06-30	1929
1987-12-31	1970
1988-06-30	2845
1988-12-31	2576
1989-06-30	1220
1989-12-31	1754
1990-06-30	2401
1990-12-31	1382
1991-06-30	1208
1991-12-31	672
1992-06-30	1094
1992-12-31	1024
1993-06-30	1253
1993-12-31	1323
1994-06-30	1948
1994-12-31	1229
1995-06-30	10716
1995-12-31	1184
1996-06-30	1187
1996-12-31	1209
1997-06-30	1303
1997-12-31	1236
1998-06-30	1967
1998-12-31	1862
1999-06-30	1090