Bi-annual	US dollars
1987-06-30	3012
1987-12-31	3242
1988-06-30	3307
1988-12-31	3265
1989-06-30	3076
1989-12-31	2664
1990-06-30	2391
1990-12-31	2236
1991-06-30	2084
1991-12-31	2400
1992-06-30	2101
1992-12-31	2077
1993-06-30	1871
1993-12-31	1911
1994-06-30	2009
1994-12-31	2096
1995-06-30	2122
1995-12-31	2320
1996-06-30	2175
1996-12-31	2167
1997-06-30	2720
1997-12-31	5012
1998-06-30	5155
1998-12-31	5646
1999-06-30	6211