Bi-annual	US dollars
1987-06-30	1719
1987-12-31	1944
1988-06-30	2239
1988-12-31	2123
1989-06-30	1724
1989-12-31	1364
1990-06-30	1243
1990-12-31	1005
1991-06-30	1555
1991-12-31	1212
1992-06-30	1802
1992-12-31	1515
1993-06-30	3129
1993-12-31	2501
1994-06-30	3190
1994-12-31	3996
1995-06-30	5351
1995-12-31	6278
1996-06-30	6244
1996-12-31	6752
1997-06-30	7165
1997-12-31	8574
1998-06-30	9600
1998-12-31	7633
1999-06-30	7253