Bi-annual	US dollars
1987-06-30	2599
1987-12-31	3055
1988-06-30	2149
1988-12-31	2616
1989-06-30	2359
1989-12-31	3564
1990-06-30	3711
1990-12-31	3328
1991-06-30	2230
1991-12-31	2449
1992-06-30	2752
1992-12-31	2785
1993-06-30	3139
1993-12-31	3487
1994-06-30	3299
1994-12-31	3284
1995-06-30	2249
1995-12-31	2304
1996-06-30	2202
1996-12-31	2902
1997-06-30	3086
1997-12-31	4018
1998-06-30	3341
1998-12-31	2829
1999-06-30	3463