Bi-annual	US dollars
1987-06-30	1042
1987-12-31	755
1988-06-30	556
1988-12-31	530
1989-06-30	512
1989-12-31	335
1990-06-30	333
1990-12-31	486
1991-06-30	446
1991-12-31	695
1992-06-30	677
1992-12-31	709
1993-06-30	924
1993-12-31	974
1994-06-30	1380
1994-12-31	1214
1995-06-30	1269
1995-12-31	1704
1996-06-30	1897
1996-12-31	2238
1997-06-30	3775
1997-12-31	4865
1998-06-30	3171
1998-12-31	4298
1999-06-30	3426