Bi-annual	US dollars
1987-06-30	1009
1987-12-31	1138
1988-06-30	967
1988-12-31	864
1989-06-30	2175
1989-12-31	2035
1990-06-30	1120
1990-12-31	1418
1991-06-30	934
1991-12-31	1225
1992-06-30	1203
1992-12-31	753
1993-06-30	1130
1993-12-31	1556
1994-06-30	1347
1994-12-31	1065
1995-06-30	1963
1995-12-31	1924
1996-06-30	2404
1996-12-31	1207
1997-06-30	1243
1997-12-31	1196
1998-06-30	1075
1998-12-31	2752
1999-06-30	2051