Bi-annual	US dollars
1987-06-30	1090
1987-12-31	1177
1988-06-30	1179
1988-12-31	1998
1989-06-30	1680
1989-12-31	1909
1990-06-30	2103
1990-12-31	3355
1991-06-30	2628
1991-12-31	3203
1992-06-30	2933
1992-12-31	2419
1993-06-30	2155
1993-12-31	1511
1994-06-30	2690
1994-12-31	3462
1995-06-30	2642
1995-12-31	2313
1996-06-30	1889
1996-12-31	1972
1997-06-30	1587
1997-12-31	1854
1998-06-30	3188
1998-12-31	2855
1999-06-30	2722