Bi-annual	US dollars
1987-06-30	34
1987-12-31	55
1988-06-30	29
1988-12-31	42
1989-06-30	47
1989-12-31	60
1990-06-30	65
1990-12-31	93
1991-06-30	60
1991-12-31	121
1992-06-30	89
1992-12-31	85
1993-06-30	90
1993-12-31	129
1994-06-30	105
1994-12-31	197
1995-06-30	161
1995-12-31	143
1996-06-30	149
1996-12-31	209
1997-06-30	233
1997-12-31	318
1998-06-30	272
1998-12-31	298
1999-06-30	225