Bi-annual	US dollars
1987-06-30	7000
1987-12-31	9276
1988-06-30	11964
1988-12-31	13309
1989-06-30	13994
1989-12-31	14301
1990-06-30	16326
1990-12-31	16609
1991-06-30	13381
1991-12-31	13528
1992-06-30	10617
1992-12-31	11199
1993-06-30	19418
1993-12-31	16647
1994-06-30	16858
1994-12-31	13735
1995-06-30	15814
1995-12-31	19037
1996-06-30	16244
1996-12-31	15910
1997-06-30	20519
1997-12-31	18245
1998-06-30	19662
1998-12-31	18733
1999-06-30	10572