Bi-annual	US dollars
1987-06-30	223
1987-12-31	249
1988-06-30	229
1988-12-31	224
1989-06-30	189
1989-12-31	219
1990-06-30	248
1990-12-31	270
1991-06-30	230
1991-12-31	213
1992-06-30	236
1992-12-31	164
1993-06-30	164
1993-12-31	143
1994-06-30	142
1994-12-31	111
1995-06-30	110
1995-12-31	88
1996-06-30	71
1996-12-31	55
1997-06-30	33
1997-12-31	25
1998-06-30	20
1998-12-31	15
1999-06-30	13