Bi-annual	US dollars
1987-06-30	35
1987-12-31	43
1988-06-30	102
1988-12-31	83
1989-06-30	84
1989-12-31	100
1990-06-30	1475
1990-12-31	2533
1991-06-30	1623
1991-12-31	2833
1992-06-30	2649
1992-12-31	2333
1993-06-30	2284
1993-12-31	2146
1994-06-30	2045
1994-12-31	2251
1995-06-30	1922
1995-12-31	1964
1996-06-30	1944
1996-12-31	2036
1997-06-30	2249
1997-12-31	2294
1998-06-30	2206
1998-12-31	1809
1999-06-30	1556