Bi-annual	US dollars
1987-06-30	43259
1987-12-31	55265
1988-06-30	53534
1988-12-31	52143
1989-06-30	55841
1989-12-31	58664
1990-06-30	63079
1990-12-31	68464
1991-06-30	57790
1991-12-31	62680
1992-06-30	64276
1992-12-31	62969
1993-06-30	80193
1993-12-31	81006
1994-06-30	89339
1994-12-31	96290
1995-06-30	97511
1995-12-31	95118
1996-06-30	97298
1996-12-31	97376
1997-06-30	116983
1997-12-31	123506
1998-06-30	127927
1998-12-31	123226
1999-06-30	135315