Bi-annual	US dollars
1987-06-30	303
1987-12-31	236
1988-06-30	208
1988-12-31	184
1989-06-30	172
1989-12-31	142
1990-06-30	129
1990-12-31	149
1991-06-30	89
1991-12-31	138
1992-06-30	156
1992-12-31	167
1993-06-30	159
1993-12-31	166
1994-06-30	120
1994-12-31	136
1995-06-30	145
1995-12-31	144
1996-06-30	106
1996-12-31	123
1997-06-30	145
1997-12-31	181
1998-06-30	183
1998-12-31	258
1999-06-30	319