Bi-annual	US dollars
1987-06-30	274
1987-12-31	306
1988-06-30	289
1988-12-31	191
1989-06-30	211
1989-12-31	213
1990-06-30	248
1990-12-31	291
1991-06-30	28
1991-12-31	84
1992-06-30	53
1992-12-31	112
1993-06-30	116
1993-12-31	152
1994-06-30	103
1994-12-31	147
1995-06-30	95
1995-12-31	162
1996-06-30	127
1996-12-31	154
1997-06-30	168
1997-12-31	262
1998-06-30	426
1998-12-31	268
1999-06-30	366