Bi-annual	US dollars
1987-06-30	27
1987-12-31	30
1988-06-30	24
1988-12-31	16
1989-06-30	28
1989-12-31	21
1990-06-30	61
1990-12-31	77
1991-06-30	156
1991-12-31	166
1992-06-30	179
1992-12-31	262
1993-06-30	362
1993-12-31	411
1994-06-30	340
1994-12-31	424
1995-06-30	487
1995-12-31	842
1996-06-30	909
1996-12-31	769
1997-06-30	554
1997-12-31	433
1998-06-30	283
1998-12-31	170
1999-06-30	155