Bi-annual	US dollars
1987-06-30	156
1987-12-31	100
1988-06-30	75
1988-12-31	118
1989-06-30	67
1989-12-31	214
1990-06-30	89
1990-12-31	114
1991-06-30	63
1991-12-31	355
1992-06-30	333
1992-12-31	162
1993-06-30	378
1993-12-31	228
1994-06-30	358
1994-12-31	386
1995-06-30	197
1995-12-31	138
1996-06-30	196
1996-12-31	293
1997-06-30	96
1997-12-31	342
1998-06-30	220
1998-12-31	323
1999-06-30	246