Bi-annual	US dollars
1987-06-30	524
1987-12-31	219
1988-06-30	218
1988-12-31	184
1989-06-30	240
1989-12-31	297
1990-06-30	415
1990-12-31	403
1991-06-30	465
1991-12-31	814
1992-06-30	683
1992-12-31	600
1993-06-30	627
1993-12-31	625
1994-06-30	633
1994-12-31	419
1995-06-30	448
1995-12-31	561
1996-06-30	368
1996-12-31	607
1997-06-30	529
1997-12-31	1361
1998-06-30	1007
1998-12-31	1180
1999-06-30	1261