Bi-annual	US dollars
1987-06-30	6677
1987-12-31	7050
1988-06-30	5197
1988-12-31	5061
1989-06-30	4849
1989-12-31	4499
1990-06-30	5094
1990-12-31	7469
1991-06-30	7055
1991-12-31	10372
1992-06-30	11079
1992-12-31	12122
1993-06-30	25286
1993-12-31	26795
1994-06-30	21239
1994-12-31	51843
1995-06-30	57340
1995-12-31	64397
1996-06-30	67507
1996-12-31	82861
1997-06-30	87263
1997-12-31	104245
1998-06-30	121771
1998-12-31	131330
1999-06-30	128128