Bi-annual	US dollars
1987-06-30	443
1987-12-31	672
1988-06-30	599
1988-12-31	548
1989-06-30	468
1989-12-31	892
1990-06-30	752
1990-12-31	710
1991-06-30	665
1991-12-31	895
1992-06-30	628
1992-12-31	648
1993-06-30	336
1993-12-31	248
1994-06-30	336
1994-12-31	291
1995-06-30	444
1995-12-31	515
1996-06-30	548
1996-12-31	524
1997-06-30	556
1997-12-31	2282
1998-06-30	2546
1998-12-31	2970
1999-06-30	2884