Bi-annual	US dollars
1987-06-30	203
1987-12-31	457
1988-06-30	416
1988-12-31	108
1989-06-30	160
1989-12-31	100
1990-06-30	195
1990-12-31	228
1991-06-30	133
1991-12-31	252
1992-06-30	270
1992-12-31	235
1993-06-30	221
1993-12-31	235
1994-06-30	338
1994-12-31	424
1995-06-30	248
1995-12-31	400
1996-06-30	502
1996-12-31	459
1997-06-30	591
1997-12-31	499
1998-06-30	405
1998-12-31	341
1999-06-30	388