Bi-annual	US dollars
1987-06-30	60
1987-12-31	45
1988-06-30	56
1988-12-31	69
1989-06-30	68
1989-12-31	160
1990-06-30	215
1990-12-31	228
1991-06-30	285
1991-12-31	280
1992-06-30	274
1992-12-31	138
1993-06-30	207
1993-12-31	183
1994-06-30	204
1994-12-31	263
1995-06-30	327
1995-12-31	250
1996-06-30	204
1996-12-31	193
1997-06-30	215
1997-12-31	183
1998-06-30	200
1998-12-31	339
1999-06-30	129