Bi-annual	US dollars
1987-06-30	69352
1987-12-31	79460
1988-06-30	76154
1988-12-31	75365
1989-06-30	78617
1989-12-31	83486
1990-06-30	88253
1990-12-31	96079
1991-06-30	85121
1991-12-31	93549
1992-06-30	96716
1992-12-31	95247
1993-06-30	129807
1993-12-31	133165
1994-06-30	134842
1994-12-31	166659
1995-06-30	174560
1995-12-31	169890
1996-06-30	181846
1996-12-31	196717
1997-06-30	218533
1997-12-31	243397
1998-06-30	270629
1998-12-31	250825
1999-06-30	254992