Bi-annual	US dollars
1987-06-30	52
1987-12-31	87
1988-06-30	118
1988-12-31	259
1989-06-30	116
1989-12-31	127
1990-06-30	148
1990-12-31	168
1991-06-30	185
1991-12-31	276
1992-06-30	341
1992-12-31	297
1993-06-30	911
1993-12-31	602
1994-06-30	840
1994-12-31	986
1995-06-30	1223
1995-12-31	1292
1996-06-30	1488
1996-12-31	1566
1997-06-30	1785
1997-12-31	2335
1998-06-30	2564
1998-12-31	2398
1999-06-30	2572