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Key performance indicators(1)

KPI 2008(2) 2007(3) 2006(4)
Number of mobile operating subsidiaries undertaking      
independent RF field monitoring 15 15 15
Total energy use (GWh) (direct and indirect)(5) 2,996 2,690 2,900
Total carbon dioxide emissions (millions of tonnes)(5) 1.45 1.23 1.31
Percentage of energy sourced from renewables 18 17 12
Number of phones collected for reuse and recycling (millions) 1.33 1.03 1.37
Network equipment waste generated (tonnes) 12,096 9,960 2,950
Percentage of network equipment waste sent for reuse or recycling 96 97 97
(1) These performance indicators were calculated using actual or estimated data collected by the Group’s mobile operating companies. The data is sourced from invoices, purchasing requisitions, direct data measurement and estimations where required. The carbon dioxide emissions figure is calculated using the kWh/CO2 conversion factor for the electricity provided by the national grid and for other energy sources in each operating company. The Group’s joint venture in Italy is included in all years.
(2) The data for the 2008 financial year excludes the newly acquired Vodafone Essar in India and Tele2 in Italy and Spain.
(3) The data for the 2007 financial year excludes the newly acquired operations in Turkey and the operations in Japan that were sold during the 2007 financial year.
(4) The data for the 2006 financial year excludes the acquired businesses in Czech Republic and Romania and the business in Sweden that was sold during the 2006 financial year, but does include the business in Japan that was disposed of during the 2007 financial year.
(5) The 2007 figure includes Arcor.