Source: African Development Bank
From the forward:
The African Statistical Yearbook (ASYB) 2012 is the fourth edition jointly produced by the African Development Bank (AfDB), the African Union Commission (AUC), and the United Nations Economic Commission for Africa (ECA). It is a result of the fruitful collaboration that exists among the three pan-African organizations within the field of statistics. This synergistic collaboration has two principal benefits: (1) it minimizes the risk of inconsistent information being produced by the three organizations, and (2) it reduces the reporting burden on member states, who might otherwise be obliged to submit data separately to each institution.
As in the previous three editions, this 2012 Yearbook presents a time series showing the performance of African countries for various economic and social indicators over the period 2003–2011. The exception is for the mining sector, where the timeframe is 2001–2009, owing to the inherent lag in compiling data for the relevant indicators.