Federal Net Outlays as Percent of Gross Domestic Product (FYONGDA188S) (https://fred.stlouisfed.org/series/FYONGDA188S) was first constructed by the Federal Reserve Bank of St. Louis in January 2013. It is calculated using Federal Net Outlays (FYONET) (https://fred.stlouisfed.org/series/FYONET) and Gross Domestic Product (GDPA) (https://fred.stlouisfed.org/series/GDPA): FYONGDA188S = ((FYONET/1000)/GDPA)*100 FYONET/1000 transforms FYONET from millions of dollars to billions of dollars.