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["Number of members belonging to Friends of the Earth, 1971-2008 ('000)"]
[]
[null,1971,{"$f":"B3+1","v":1972},1973,1974,1975,1976,1977,{"$f":"H3+1","v":1978},1979,1980,1981,1982,1983,1984,1985,1986,1987,1988,1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009]
["Friends of the Earth",1,3,{"$f":"(C4+E4)/2","v":4},5,5,5,6,15,16,{"$f":"(J4+L4)/2","v":17},18,16,20,27,29,28,55,65,140,110,111,116,120,112,110,{"$f":"(Z4+AB4)/2","v":112},114,114,112,114,{"$f":"(AE4+AG4)/2","v":116.5},119,{"$f":"(AG4+AI4)/2","v":109.5},100,{"$f":"(AI4+AK4)/2","v":100},100,{"$f":"(AK4+AM4)/2","v":100},100,100]
["Alternative figures",1,3,{"$f":"(C5+E5)/2","v":4},5,5,5,6,15,16,{"$f":"(J5+L5)/2","v":17},18,16,20,27,29,28,55,65,200,220,240,256,230,{"$f":"(X5+Z5)/2","v":205},180,{"$f":"(Z5+AB5)/2","v":147},114,114,112,114,{"$f":"(AE5+AG5)/2","v":116.5},119,{"$f":"(AG5+AI5)/2","v":109.5},100,{"$f":"(AI5+AK5)/2","v":100},100,{"$f":"(AK5+AM5)/2","v":100},100,100]
[]
["Source: Estimations based on sometimes conflicting sources: Annual reports; Social Trends, various years, Neil Carter, The Politics of the Environment: Ideas, Activism, Policy (Cambridge,  2007); Francis Sandbach, Environment, Ideology and Policy (Oxford: 1980); Paul Byrne, Social Movements in Britain (London, 1997); Robert Lamb, Promising the Earth (London, 1996); Joe Weston, The F.O.E. Experience : The Development of an Environmental Pressure Group (Oxford, 1989); Peter Rawcliffe, Environmental Pressure Groups in Transition (Manchester, 1998). For the period around 1989-90, the low estimates are provided by Social Trends while the high estimates come from Lamb, Byrne and Rawcliffe."]