Bi-annual	US dollars
1987-06-30	295
1987-12-31	400
1988-06-30	307
1988-12-31	284
1989-06-30	524
1989-12-31	572
1990-06-30	572
1990-12-31	656
1991-06-30	525
1991-12-31	527
1992-06-30	421
1992-12-31	347
1993-06-30	392
1993-12-31	615
1994-06-30	610
1994-12-31	621
1995-06-30	628
1995-12-31	572
1996-06-30	623
1996-12-31	1079
1997-06-30	1266
1997-12-31	2183
1998-06-30	2776
1998-12-31	1805
1999-06-30	1851