Bi-annual	US dollars
1987-06-30	522
1987-12-31	368
1988-06-30	259
1988-12-31	161
1989-06-30	127
1989-12-31	76
1990-06-30	58
1990-12-31	216
1991-06-30	233
1991-12-31	254
1992-06-30	183
1992-12-31	159
1993-06-30	279
1993-12-31	155
1994-06-30	99
1994-12-31	89
1995-06-30	103
1995-12-31	90
1996-06-30	138
1996-12-31	63
1997-06-30	125
1997-12-31	204
1998-06-30	165
1998-12-31	369
1999-06-30	872