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  source: http://www.bp.com/sectiongenericarticle800.do?categoryId=9037130&contentId=7068669
 http://www.bp.com/liveassets/bp_internet/globalbp/globalbp_uk_english/reports_and_publications/
   statistical_energy_review_2011/STAGING/local_assets/spreadsheets/statistical_review_of_world_energy_full_report_2012.xlsx
 all data per day, look in: 'statistical_review_of_world_energy_full_report_2012.xlsx", tab 'Oil Consumption - barrels'
   -> values of tab 'Oil Consumption - tonnes' = tab 'Primary Energy - Cons by fuel'

 Nuclear, hydro, renewable energy in TWh

 Oil, gas, coal are to be calculated into TWh as follows:
 1 toe = 11.63 MWh (http://en.wikipedia.org/wiki/Tonne_of_oil_equivalent)
 BP thermal to electrical conversion efficiency: 38%, recalculated by use of:
       'statistical_review_of_world_energy_full_report_2012.xlsx", tab 'Primary Energy - Cons by fuel'
       i.e. nuclear 2011: 2648.7 TWh / 599.3 Mtoe = 4.4194 TWh/Mtoe; 4.4194 MWh/toe / 11.63 MWh/toe = 0.38 = 38%
  -> 1 toe = 4.4194 MWh energy production
  -> 1 Mio toe = 4.4194 TWh energy production