Bi-annual	US dollars
1987-06-30	97
1987-12-31	117
1988-06-30	131
1988-12-31	121
1989-06-30	175
1989-12-31	195
1990-06-30	204
1990-12-31	208
1991-06-30	182
1991-12-31	192
1992-06-30	221
1992-12-31	205
1993-06-30	285
1993-12-31	160
1994-06-30	222
1994-12-31	280
1995-06-30	223
1995-12-31	254
1996-06-30	207
1996-12-31	164
1997-06-30	303
1997-12-31	329
1998-06-30	492
1998-12-31	303
1999-06-30	216