Bi-annual	US dollars
1987-06-30	169
1987-12-31	164
1988-06-30	215
1988-12-31	291
1989-06-30	208
1989-12-31	179
1990-06-30	157
1990-12-31	102
1991-06-30	410
1991-12-31	280
1992-06-30	185
1992-12-31	159
1993-06-30	383
1993-12-31	222
1994-06-30	622
1994-12-31	487
1995-06-30	533
1995-12-31	682
1996-06-30	673
1996-12-31	736
1997-06-30	779
1997-12-31	926
1998-06-30	877
1998-12-31	1924
1999-06-30	563