Bi-annual	US dollars
1987-06-30	319
1987-12-31	323
1988-06-30	391
1988-12-31	550
1989-06-30	498
1989-12-31	635
1990-06-30	443
1990-12-31	365
1991-06-30	370
1991-12-31	351
1992-06-30	415
1992-12-31	570
1993-06-30	887
1993-12-31	925
1994-06-30	894
1994-12-31	912
1995-06-30	948
1995-12-31	1168
1996-06-30	968
1996-12-31	943
1997-06-30	576
1997-12-31	239
1998-06-30	1341
1998-12-31	820
1999-06-30	402