How incumbent governments performed compared with polling deficit/lead 18 months before election
*For 1992 the first month of John Major's premiership is used
Created with Raphaël 2.1.2
2010
-10
1.3
-5
5
10
15
20
-4
1979
23.3
1983
11
1987
-0.8
1992*
17.5
1997
-10
2001
1.2
2005
1.3
2010
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