Bi-annual	US dollars
1987-06-30	155
1987-12-31	160
1988-06-30	162
1988-12-31	136
1989-06-30	192
1989-12-31	132
1990-06-30	146
1990-12-31	241
1991-06-30	339
1991-12-31	170
1992-06-30	320
1992-12-31	336
1993-06-30	767
1993-12-31	501
1994-06-30	292
1994-12-31	462
1995-06-30	550
1995-12-31	715
1996-06-30	659
1996-12-31	596
1997-06-30	1008
1997-12-31	390
1998-06-30	1069
1998-12-31	1391
1999-06-30	3609