Bi-annual	US dollars
1987-06-30	95
1987-12-31	130
1988-06-30	217
1988-12-31	405
1989-06-30	575
1989-12-31	513
1990-06-30	563
1990-12-31	509
1991-06-30	496
1991-12-31	529
1992-06-30	451
1992-12-31	485
1993-06-30	758
1993-12-31	888
1994-06-30	963
1994-12-31	1228
1995-06-30	1284
1995-12-31	1355
1996-06-30	1479
1996-12-31	2084
1997-06-30	2424
1997-12-31	2567
1998-06-30	2187
1998-12-31	2162
1999-06-30	2286