Bi-annual	US dollars
1987-06-30	51242
1987-12-31	50441
1988-06-30	53636
1988-12-31	59700
1989-06-30	46402
1989-12-31	51116
1990-06-30	45002
1990-12-31	41147
1991-06-30	43082
1991-12-31	49409
1992-06-30	56597
1992-12-31	48024
1993-06-30	56789
1993-12-31	59776
1994-06-30	69373
1994-12-31	68416
1995-06-30	67613
1995-12-31	59345
1996-06-30	61696
1996-12-31	68214
1997-06-30	67941
1997-12-31	71314
1998-06-30	78298
1998-12-31	82997
1999-06-30	84220