Bi-annual	US dollars
1987-06-30	624
1987-12-31	957
1988-06-30	752
1988-12-31	886
1989-06-30	834
1989-12-31	716
1990-06-30	813
1990-12-31	1048
1991-06-30	1312
1991-12-31	1072
1992-06-30	1098
1992-12-31	898
1993-06-30	1167
1993-12-31	1273
1994-06-30	1468
1994-12-31	1166
1995-06-30	983
1995-12-31	746
1996-06-30	632
1996-12-31	1904
1997-06-30	2204
1997-12-31	1450
1998-06-30	1707
1998-12-31	1641
1999-06-30	2185