Bi-annual	US dollars
1987-06-30	77648
1987-12-31	94465
1988-06-30	89933
1988-12-31	92606
1989-06-30	97549
1989-12-31	95197
1990-06-30	101353
1990-12-31	110917
1991-06-30	98723
1991-12-31	104320
1992-06-30	108829
1992-12-31	109307
1993-06-30	137386
1993-12-31	126858
1994-06-30	138283
1994-12-31	131704
1995-06-30	146490
1995-12-31	141613
1996-06-30	130757
1996-12-31	156319
1997-06-30	221975
1997-12-31	259048
1998-06-30	254182
1998-12-31	242415
1999-06-30	244396