Bi-annual	US dollars
1987-06-30	216
1987-12-31	164
1988-06-30	109
1988-12-31	139
1989-06-30	85
1989-12-31	150
1990-06-30	117
1990-12-31	108
1991-06-30	73
1991-12-31	125
1992-06-30	131
1992-12-31	89
1993-06-30	117
1993-12-31	106
1994-06-30	361
1994-12-31	374
1995-06-30	259
1995-12-31	288
1996-06-30	306
1996-12-31	248
1997-06-30	213
1997-12-31	270
1998-06-30	358
1998-12-31	419
1999-06-30	552