Bi-annual	US dollars
1987-06-30	2357
1987-12-31	2604
1988-06-30	2611
1988-12-31	2273
1989-06-30	1353
1989-12-31	974
1990-06-30	532
1990-12-31	465
1991-06-30	1007
1991-12-31	850
1992-06-30	1106
1992-12-31	921
1993-06-30	911
1993-12-31	1595
1994-06-30	2011
1994-12-31	1622
1995-06-30	1982
1995-12-31	2073
1996-06-30	2119
1996-12-31	2577
1997-06-30	2148
1997-12-31	1881
1998-06-30	1549
1998-12-31	1884
1999-06-30	1845