Bi-annual	US dollars
1987-06-30	95
1987-12-31	75
1988-06-30	106
1988-12-31	114
1989-06-30	110
1989-12-31	106
1990-06-30	148
1990-12-31	143
1991-06-30	88
1991-12-31	99
1992-06-30	120
1992-12-31	126
1993-06-30	279
1993-12-31	322
1994-06-30	415
1994-12-31	449
1995-06-30	542
1995-12-31	456
1996-06-30	493
1996-12-31	625
1997-06-30	597
1997-12-31	668
1998-06-30	799
1998-12-31	1143
1999-06-30	1061