Bi-annual	US dollars
1987-06-30	5553
1987-12-31	7291
1988-06-30	8011
1988-12-31	5843
1989-06-30	7726
1989-12-31	6110
1990-06-30	8270
1990-12-31	7382
1991-06-30	6463
1991-12-31	6436
1992-06-30	10428
1992-12-31	8596
1993-06-30	10310
1993-12-31	10201
1994-06-30	10989
1994-12-31	12661
1995-06-30	13991
1995-12-31	12202
1996-06-30	13622
1996-12-31	9898
1997-06-30	10531
1997-12-31	13019
1998-06-30	16266
1998-12-31	8922
1999-06-30	19783