Bi-annual	US dollars
1987-06-30	89123
1987-12-31	107994
1988-06-30	103693
1988-12-31	109503
1989-06-30	113196
1989-12-31	111396
1990-06-30	117095
1990-12-31	125601
1991-06-30	113125
1991-12-31	120316
1992-06-30	127268
1992-12-31	128708
1993-06-30	162639
1993-12-31	153642
1994-06-30	169387
1994-12-31	163343
1995-06-30	179246
1995-12-31	178936
1996-06-30	169720
1996-12-31	195876
1997-06-30	267491
1997-12-31	309896
1998-06-30	303283
1998-12-31	294460
1999-06-30	291341