Bi-annual	US dollars
1987-06-30	100
1987-12-31	96
1988-06-30	51
1988-12-31	105
1989-06-30	79
1989-12-31	129
1990-06-30	70
1990-12-31	100
1991-06-30	115
1991-12-31	106
1992-06-30	202
1992-12-31	144
1993-06-30	411
1993-12-31	470
1994-06-30	383
1994-12-31	1710
1995-06-30	1597
1995-12-31	1578
1996-06-30	1133
1996-12-31	801
1997-06-30	729
1997-12-31	836
1998-06-30	1002
1998-12-31	1398
1999-06-30	1266