Bi-annual	US dollars
1987-06-30	152
1987-12-31	164
1988-06-30	153
1988-12-31	155
1989-06-30	172
1989-12-31	185
1990-06-30	195
1990-12-31	206
1991-06-30	198
1991-12-31	250
1992-06-30	276
1992-12-31	221
1993-06-30	117
1993-12-31	236
1994-06-30	256
1994-12-31	280
1995-06-30	282
1995-12-31	287
1996-06-30	329
1996-12-31	288
1997-06-30	298
1997-12-31	378
1998-06-30	362
1998-12-31	328
1999-06-30	238