Bi-annual	US dollars
1987-06-30	48475
1987-12-31	57610
1988-06-30	55197
1988-12-31	55714
1989-06-30	57235
1989-12-31	62817
1990-06-30	65534
1990-12-31	71637
1991-06-30	61619
1991-12-31	66888
1992-06-30	65387
1992-12-31	65765
1993-06-30	86708
1993-12-31	85943
1994-06-30	94393
1994-12-31	93901
1995-06-30	94617
1995-12-31	85439
1996-06-30	95304
1996-12-31	96498
1997-06-30	103755
1997-12-31	125204
1998-06-30	132172
1998-12-31	114232
1999-06-30	110032