The economy grows 41% faster under Democratic presidents.
    Average GDP growth per year under Democratic Presidents: 4.05%
    Average GDP growth per year under Republican Presidents: 2.88%
    Average GDP growth under the Bush II Administration: 2.51%
 

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This data is listed under the first column in Table B-4 ERP(Percent Changes in Real Gross Domestic Product, 1959-2007) under the heading “Gross Domestic Product”.