Bi-annual	US dollars
1987-06-30	1017
1987-12-31	732
1988-06-30	508
1988-12-31	360
1989-06-30	425
1989-12-31	248
1990-06-30	204
1990-12-31	417
1991-06-30	413
1991-12-31	527
1992-06-30	514
1992-12-31	620
1993-06-30	1026
1993-12-31	1011
1994-06-30	1378
1994-12-31	1015
1995-06-30	1026
1995-12-31	1158
1996-06-30	1229
1996-12-31	1418
1997-06-30	2011
1997-12-31	2004
1998-06-30	1614
1998-12-31	2010
1999-06-30	2051