Bi-annual	US dollars
1987-06-30	198
1987-12-31	153
1988-06-30	174
1988-12-31	141
1989-06-30	135
1989-12-31	155
1990-06-30	232
1990-12-31	328
1991-06-30	328
1991-12-31	336
1992-06-30	318
1992-12-31	592
1993-06-30	890
1993-12-31	662
1994-06-30	806
1994-12-31	876
1995-06-30	958
1995-12-31	1237
1996-06-30	1196
1996-12-31	1630
1997-06-30	2075
1997-12-31	1777
1998-06-30	1339
1998-12-31	1306
1999-06-30	572