Bi-annual	US dollars
1987-06-30	337
1987-12-31	409
1988-06-30	321
1988-12-31	334
1989-06-30	319
1989-12-31	300
1990-06-30	251
1990-12-31	226
1991-06-30	174
1991-12-31	164
1992-06-30	156
1992-12-31	121
1993-06-30	120
1993-12-31	67
1994-06-30	43
1994-12-31	47
1995-06-30	46
1995-12-31	51
1996-06-30	75
1996-12-31	135
1997-06-30	213
1997-12-31	485
1998-06-30	505
1998-12-31	310
1999-06-30	473