Bi-annual	US dollars
1987-06-30	9109
1987-12-31	7757
1988-06-30	8087
1988-12-31	8429
1989-06-30	6029
1989-12-31	5595
1990-06-30	5528
1990-12-31	3919
1991-06-30	4081
1991-12-31	3127
1992-06-30	3534
1992-12-31	3162
1993-06-30	3610
1993-12-31	4375
1994-06-30	5694
1994-12-31	5062
1995-06-30	12592
1995-12-31	3158
1996-06-30	4184
1996-12-31	5513
1997-06-30	5267
1997-12-31	4444
1998-06-30	6489
1998-12-31	5754
1999-06-30	4231