In a letter dated 19 June 2001 to Bjørn Willum, the National Bank of Rwanda provided the following data on Rwandan export of 'coltan':

Year                               1996 - 1997 - 1998 - 1999 - 2000

Total export - tons            97.0   228.0  199.0   329.7  603.0

Total export - US$ million 1.3      2.7         2.5      4.6    11.4

See a scanning of the original letter - page 1 - page 2

In comparison, the Rwandan Ministry of Finance has already published the following data on Rwandan domestic production of 'coltan':

Year                               1996 - 1997 - 1998 - 1999 - 2000

Total domestic
production - tons              97.0   224.0   224.0  122.0   83.0

For an analysis of these and other figures on the mineral trade, see pp.24-60 of my dissertation 'Foreign Aid to Rwanda: Purely Beneficial or Contributing to War?'