Bi-annual	US dollars
1987-06-30	385
1987-12-31	376
1988-06-30	316
1988-12-31	338
1989-06-30	239
1989-12-31	442
1990-06-30	356
1990-12-31	243
1991-06-30	300
1991-12-31	390
1992-06-30	377
1992-12-31	471
1993-06-30	789
1993-12-31	896
1994-06-30	952
1994-12-31	1148
1995-06-30	1435
1995-12-31	1747
1996-06-30	2096
1996-12-31	2274
1997-06-30	2717
1997-12-31	2183
1998-06-30	2468
1998-12-31	2518
1999-06-30	2375