Bi-annual	US dollars
1987-06-30	664
1987-12-31	877
1988-06-30	621
1988-12-31	721
1989-06-30	916
1989-12-31	1129
1990-06-30	762
1990-12-31	1355
1991-06-30	1250
1991-12-31	1597
1992-06-30	1893
1992-12-31	1806
1993-06-30	2384
1993-12-31	2390
1994-06-30	1866
1994-12-31	2849
1995-06-30	2887
1995-12-31	2282
1996-06-30	2797
1996-12-31	4191
1997-06-30	188
1997-12-31	5077
1998-06-30	5712
1998-12-31	6350
1999-06-30	5787