Bi-annual	US dollars
1987-06-30	303
1987-12-31	272
1988-06-30	160
1988-12-31	387
1989-06-30	668
1989-12-31	684
1990-06-30	794
1990-12-31	511
1991-06-30	357
1991-12-31	450
1992-06-30	832
1992-12-31	333
1993-06-30	359
1993-12-31	263
1994-06-30	284
1994-12-31	174
1995-06-30	262
1995-12-31	290
1996-06-30	267
1996-12-31	212
1997-06-30	326
1997-12-31	301
1998-06-30	337
1998-12-31	434
1999-06-30	413