Bi-annual	US dollars
1987-06-30	539
1987-12-31	385
1988-06-30	273
1988-12-31	304
1989-06-30	456
1989-12-31	350
1990-06-30	514
1990-12-31	324
1991-06-30	423
1991-12-31	601
1992-06-30	655
1992-12-31	564
1993-06-30	1436
1993-12-31	2408
1994-06-30	2089
1994-12-31	2330
1995-06-30	2366
1995-12-31	2698
1996-06-30	2463
1996-12-31	2262
1997-06-30	2648
1997-12-31	2290
1998-06-30	2939
1998-12-31	2874
1999-06-30	1780