Bi-annual	US dollars
1987-06-30	82
1987-12-31	66
1988-06-30	128
1988-12-31	87
1989-06-30	160
1989-12-31	156
1990-06-30	153
1990-12-31	274
1991-06-30	201
1991-12-31	211
1992-06-30	154
1992-12-31	79
1993-06-30	114
1993-12-31	225
1994-06-30	191
1994-12-31	227
1995-06-30	153
1995-12-31	219
1996-06-30	158
1996-12-31	166
1997-06-30	279
1997-12-31	441
1998-06-30	494
1998-12-31	451
1999-06-30	555