Bi-annual	US dollars
1987-06-30	163
1987-12-31	204
1988-06-30	198
1988-12-31	174
1989-06-30	161
1989-12-31	119
1990-06-30	113
1990-12-31	110
1991-06-30	146
1991-12-31	148
1992-06-30	211
1992-12-31	248
1993-06-30	248
1993-12-31	216
1994-06-30	181
1994-12-31	178
1995-06-30	180
1995-12-31	149
1996-06-30	172
1996-12-31	183
1997-06-30	180
1997-12-31	244
1998-06-30	252
1998-12-31	331
1999-06-30	284